Cos^2A/sinAcosecA+sinA=0 Prove lHS =RHS
8,328 results
maths
Prove SinA/1CosA = CosecA + CotA

PreCalculus
If sinA=3/5 when pi/2 < A < pi and cosB=5/13 when 3pi/2 < B < 2pi, find the exact value of the function cos(5pi/6+B).

math
if cos(BC)+cos(CA)+cos(AB)=3/2 then prove that cosA+cosB+cosC=O and sinA+sinB+sinC=O after that prove that cos(BC)=cos(CA)=cos(AB)=1/2

maths
If sinA=1/2 then find cos^3A3cosA.

Math
prove that sinA/(1+cosA) + (1+cosA)/(sinA) = 2cosecA

Precalculus (Trigonometry)
The rotating spotlight from the Coast Guard ship can illuminate up to a distance of 250 m. An observer on the shore is 500 m from the ship. HIs line of sight to the ship makes an angle of 20 degrees with the shoreline. What length of shoreline is

math (trigonometry)
if tan A/2 =cosecAsin A then prove cos^2 A/2=cos 36 degree

maths
sinA+cosA=p and secA+CosecA=q then show that q[p^21]=2p

Maths, Divine International Public School
If 15Cot=8, find (1+SinA)(1SinA)/(1+CosA)(1CosA)

math
Prove that sinA+sinB+sinC=4cosA/2cosB/2cosC/2

maths
If cosA + sinA= root2 cosA Show that cosA  sinA= root2 sinA

Maths
Cos^2A/sinAcosecA+sinA=0 Prove lHS =RHS

further mathematics
Let P=(cosA sinA) (sinA cosA) Q=(cosB sinA) (sinB cosA) show that PQ=(cosA(AB) sin(A B)) (sinA(A B) cos(AB))

Trigonometry
Prove that sin3A+sin2AsinA = 4sinAcosA/2cos3A/2

Maths
Given that sinA=2/5 and that A is obtuse,find the value of cosA. 👍 0 👎 0 👁 25 asked by Raj yesterday at 4:18am sinA = 2/5, so cosA = √21/5 But A is in QII, so cosA = √21/5 👍 0 👎 0 posted by oobleck yesterday at 6:51am Why not

precalculus
Given sina= 3/4 and cosB = (5)/13 and this is Quad II find cos(a+B)

Math
Hello I am having trouble with proving this: sinA/secA+secA/cscA = tan(A)(2sin^2(A)) So far I've gotten SinA/(1/cosA) + (1/cosA)/(1/sinA) SinACosA + sinA/cosA I am stuck here, not even sure if multiplying by the reciprocal was the right step..

math
how do you solve this.prove: cos2A plus cosA divided by sin2A minus sinA equal to cos2A plus 1 divided by sinA

Math
A 5.0m ladder is leaning 3.1m up the wall. What is the angle the ladder makes with the ground? Would this be..... sinA=3.1/5.0 sinA=0.62 sin^1=38degrees?

maths (trigonometry)
please solve these if possible Q1. If sinx +siny=3(cosycosx) then the value of sin3x/sin3y. Q2. If sina ,cosa,and tan a are in g.p.then cos cubea+cos square a is equal to

Trig
prove that tanA divided by the sinA equals the secA

Maths
TanA=√21 then find secA.sinA+tan^2AcosecA

trig
if 5cos A plus 3=0 and 180

maths
If a cosA  b sinA = c . Prove that a sinA + b cosA = _+√a^2 + b^2  c^2

trig
If (cosasina)/sina = 2 , then what is tga = ?

precal desperate
Given sina= 3/4 and cosB = (5)/13 and this is Quad II find cos(a+B)

math
12. IF 1/SinA+1/CosA=1/SinB+1/CosB ,PROVE THAT: Cot{(A+B)/2}=TanA.TanB

Math
If 1/sinA+1/cosA =1/sinB+1/cosB, prove that: cot(A/2+B/2) = TanA. TanB

Maths
Prove That Sin2A+SIN2B+SIN2C/SINA+SINB+SINC=8SinA/2SINB/2SINC/2

Maths
If sina+7sinb=4 (sinc+2sind) and cosa+7cosb=4 (cosc+2cosd), how do I prove that 2cos(ad) =7cos(bc)?

maths Pls help trig
1 .If tanA=1/3 and tanB=1/7 (both A and B are acute),calculate 50sin(2A +B) 2.1Prove that sin2A+2cosA2cos^3A/1+sinA =sin2A 2.2 for which values of A in the interval[360;360] is the identity in 2.1 undefined? 3.If tanB=3/4 , 0

math
sinA+cosA=p ,secA+cosecA=q (cosA)^2/[22(sinA)^2(cosecA)^2]=p^2/(2(p^2)q^2

Trigonometry
IfA=340°, prove that 2sinA/2 = (v1+sinA) + (v1sinA)

Maths
Prove: 1+(TanA/SinB)^2/1+(TanA/SinC)^2 = 1+(SinA/TanB)^2/1+(SinA/TanC)^2

Math, Inequalities
Prove the following inequalities. Then state for which values the LHS equals RHS. 1) a^2 + b^2 ≥ 2(ab1) 2) Given a + b = 1, prove the inequality a^2 + b^2 ≥ 1/2 Please explain how you solved it. Thanks.

Math
A=5 sec(A)/14sinA.sinA +cosecA/4cosA.cosA1 find value

trigonometry
Prove : 1 + Sin2A/ Cos2A = CosA + SinA / CosA SinA

trig
I need to count this: a) 1tg^2a/1+ctg^2a, when sina =2/3 b) 1tg^2a/1ctg^2a, when cosa= 1/3 c) tga * cos^2a, when sina + cosa=5/7 d) tg^2a + 1/sina * 1/cosa + ctg^2a, when tga + ctga =5

maths
prove that secA(1sinA)2tanA=1

maths
if 13 cos a=12, find the the value of sec a+sina?

trig
how do you do sinAcosA=cosAcos^3A/sinA

maths trignometry
Prove that. √seca+2sina/seca2sina=Sina+cosa/sinacosa

11
SinA + sinB/sinA  sinB= tanA+B/2cotAB/2

Maths
(x squared +y squared +z squared) / 3 = (x/3+y/3+z/3) squared Prove that if LHS equals to RHS, then all x=y=z Thank you

math
If sina+7sinb=4 (sinc+2sind) and cosa+7cosb=4 (cosc+2cosd), how do I prove that 2cos(ad) =7cos(bc)?

trig
Please help me how to do this: 1) 1 + sina*cosa / (cosa + sina)^2 = 2) sina + cosa / 1 2sin^2a =

Trig
Please help with this one. I've worked it out in so many ways and can't tell what's correct. sinA sinA    1+sinA 1sinA Which answer is correct for the problem above? a) 1+cotA b) sinA tanA c) 2tan^2A d) secA cscA common denominator: 1sin^2 A

Maths
Hi, can someone give me the answer to this question: secAtanA=1/4. Find cosA I got: CosA=4(1sinA) Is my answer good? Now multply each side by (1+sinA) CosA(1+sinA)=4 cos^2 A CosA=1/4 (1+sinA) 16(1sinA)=1+sinA 15=17SinA So you have sinA, now find Cos A

mathematics trignometry
prove that the following are identity 1. (cotA+cosecA1)/(cotAcosecA+1)=cosecA+cotA 2. (sinAcosA+1)/(sinA+cosA1)= 1/(secAtanA)

trig
prove that :cosAsinA+1/cosA+sinA1=cosecA+cotA

Trigonometric Identities
Verify/prove the following: (sinA+tanA)/(1+secA) = sinA ______________________________ tanu = 1+sinucos^2u/cosu(1+sinu) __________________________________ cotu = (2+cscu/secu)2cosu ______________________________ tanAsinA/tanA+sinA = tanAsinA/tanAsinA

Math
In any angle ABC prove that the perimeter = a/Sin A(Sin A + Sin B + Sin C) Start with perimeter = a+b+c but b= aSinB/sinA and c= aSinC/SinA and if you don't remember, a=a=a*SinA/ SinA

MathS triG
1 .If tanA=1/3 and tanB=1/7 (both A and B are acute),calculate 50sin(2A +B) 2.1Prove that sin2A+2cosA2cos^3A/1+sinA =sin2A 2.2 for which values of A in the interval[360;360] is the identity in 2.1 undefined? 3.If tanB=3/4 , 0

math
if tanA=root21, prove that (secA.sinA tan squareAcosecA) =(12¡Ì5)/2

trigonometry
x×sin^3A=y , cos^3A = sinA × cosA , x×sinA= y×cosA , then prove that x^2+ y^2= 1 I have no idea

math
sinA+cosA=p ,secA+cosecA=q (cosA)^2/[22(sinA)^2(cosecA)^2]=p^2/(2(p^2)q^2

Maths
Prove that [sinA/(1cosA)(1cosA)/sinA]*[cosA/(1+sinA)+(1+sinA)/cosA]=4cosecA I the second part as 2 secA

Trig
IfA=340°, prove that 2cosA/2 = (v1+sinA)  (v1sinA)

math
find all solutions in the interval [0,2 pi) sin(x+(3.14/3) + sin(x 3.14/3) =1 sin^4 x cos^2 x Since sin (a+b) = sina cosb + cosb sina and sin (ab) = sina cosb  cosb sina, the first problem can be written 2 sin x cos (pi/3)= sin x The solution to sin x =

algebra
i have a problem in dis sum from complex numbers prove that (1+sinA+icosA)/(1sinAicosA)=i(secA+tanA)

Math
CosA/1+sinA=1sinA/cosA I have to prove the identity each side has to b the same how would i do that? I have a unit test on monday so im doing practice questions

Algebra
I'm not quite sure about these problems. I know how to do them, but it seems that I get the wrong answer. Maybe I'm supposed to get 'no solution' but I'm not sure. Could someone please help me with them? 565x=15x35 23x7=10x8 1/44x+7=8x+16 Ok for

PreCalculus
How can the following two identities be verified? 1. (cos^2y)/(1siny)=1+siny 2. sin^2asin^4a=cos^2acos^4a Thanks! change cos^2a to 1sin^2a=(1sina)(1+sina) Thank you. I figured out the first one with your help, but I'm still stuck on the second. Any

Math
If secB=x,tanB=y(cosecAcotA)=4/3,sinA+cosA=?

Maths
Test the solution of an equation: Prove that x=5 is a solution of the equation: 3x3=2x+2 LHS= RHS= LHS=RHS,ie x=5 is the solution.

mathematics trignometry
if tanA=ntanX sinA=msinX then prove that cos^2A=(m^21)/(n^21)

maths(trigonometry)
prove that sinAcosA+1/sinA+cosA1=1/secAtanA

math (trig)
i have some problems doing trig the first one is: Show that cos(x/2) sin(3x/2) = ½(sinx + sin2x) i know that you are supposed to substitute all those trig function things in it but i kind of forgot how to the only that i can see substituting in is the

trig
determine wheather each of the following is an identity or not prove it 1. cos^2a+sec^2a=2+sina 2. cot^2a+cosa=sin^2a

Trig  Ambiguous Cases
Triangle HAV has

math
Determine exact value of cos(cos^1(19 pi)). is this the cos (a+b)= cos a cos b sina sin b? or is it something different. When plugging it in the calculator, do we enter it with cos and then the (cos^1(19 pi)).

Math  Vectors
If "u = (2,2,1)", "v = (3,1,0)" and "w = (1,7,8)", verify that "u (dot) (v + w) = u (dot) v + u (dot) w". My work: LHS: u (dot) (v + w) = (2,2,1) (dot) (4,6,8) = [(2,2,1) (dot) (3,1,0)] + [(2,2,1) (dot) (1,7,8)] = [u (dot) v] + [u (dot) w] Therefore,

trig
Solve (1+tan square A)(1sinA)(1+ sinA)

Maths trigonometry
Prove that cosec A_cotA by cosecA+Costa + cosecA+ Cot A by cosecA_cotA=2 cosec squareA_1=2Ã—1+cos squares by1_cos squareA

trig
Prove : (sinAcosA+1)/(sinA+cosA1) = (1+sinA)/cosA

math
prove that 1tan 4 A by1+tan 4 A =cosA + sinA by cosA  sinA

trig
Prove: 1/cos2A+sin2A/cos2A=sinA+cosA/cosAsinA

trig
Prove: 1/cos2A+sin2A/cos2A=sinA+cosA/cosAsinA

trig
How to do this one? (sina/1cosa) + (1cosa/sina) = Also, wanted to ask if I did another one right: 1  sin^2a + tg^2a * cos^2a = 1  sin^2a + (sina/cosa)^2 * cos^2a = 1  sin^2a + sin^2a = 1 ???

trig
Prove that sin(A+B+C+)cos(B+C)cos(A+B+C)sin(B+C)=sinA

Math: Law of Vectors (Cross Product)
(au) × v + (bu) × v = [(a + b)u] × v u = ( x , y , z ) v = ( x₂, y₂,z₂) LHS: = (au) × v + (bu) × v = [ ay z₂ y₂az ,  (axz₂ x₂az) , axy₂ x₂ay ] + [ by z₂ y₂bz ,  (bxz₂ x₂bz) , bxy₂ x₂by ] RHS: = [(a + b)u] × v = [

trig
Establish the following identity: CosA/1TanA + SinA/1CotA = CosASinA

Trig
I don't know the physics behind Snell's Law, but I can do the math Snell's Law says sin(angle of incidence)/sin(angle of reflection) = refractive index since you know the two angles... sin45/sin27 = refractive index =1.5575365 so for an angle of refection

algebra
prove that cosA/1sinA=2cosecA

Math trigonometry
Prove sinA/1+cosA =tan1/2A

mathamethics
RHS and LHS . 5p + 3 = 2p + 9

mathamethics
RHS and LHS . 5p + 3 = 2p + 9

math
if A+B+C=180degrees, prove that 2sin(B+C)sinA=1cos2A

Advanced Mathematics
verify that cos(90+A)=sinA is an identity.

Trigonometric Identities
Verify/prove that: sinAcosA/1cosA = sin^2/tanAsinA

Math
Find angle A if it is greater than or equal to 0 degrees and smaller than or equal to 180 degrees. round to the nearest tenth of a degree, if necessary. a) sinA = 0.5 b) cosA = 0.5 e) cosA = 0.4561 g) sinA = 0.5736 PLEASE HELP WID THIS!!:( i tried so

Physics please help me!
Prove the law of sines for triangle ABC i.e sinA/a=sinB/b=sinC/c.0 please help me!!!

TRIG!
Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6 x=1  (3/4)sin^2 2x work on one side only! Responses Trig please help!  Reiny, Monday, February 23, 2009 at 4:27pm LS looks like the sum of cubes sin^6 x + cos^6 x = (sin^2x)^3 +

trig
I need to prove equality. a) (sina + cosa)^2 1 / ctga  sinacosa = 2tg^2a b) (sin^2x/sinxcosx)  (sinx+cosx/tg^2x+1) = sinx + cosx c) sin^4a  sin^2a  cos^4a + cos^2a = cosπ/2 How to do these?

math
Given that [sin(AB)/cos(A+B)]=1/3[tan(AB)], find the values of cosB if sinA=1/2

Math2
IF (1/SinA)+(1/cosA)= (1/sinB)+(1/cosB) Prove that cot((A+B)/2)=tanA tanB Please helppppppppppp

math
SinA➖cosA/sinA➕cosA➕sinA➕cosA/sinA➖cosA=2/cos2A

Trigonomentry plz help
tanA=ntanB sinA=msinB find cos^2A in terms of 'm' and 'n' plz help

trigonometry
sinA= 3/5 and C=17 Finding a and b Their two triangles and i have to find the ratio i just can’t seem to set up the problem right but i gave an example of one of the practice exercise that dealt with finding only (a) so i got confused with finding a and

Algebra II/ Trig
Should the triangle be solved beginning with Laws of Sines or Laws of Cosines. Then solve the triangle and round to the nearest tenth. a=16, b=13, c=10 I got this answer but it is wrong and don't understand where I made the mistake. a=16, b=13, c=10