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Trigonometric Identities
Page 3
Questions (1,667)
Use a counter example to show that cos(x+y)= cosx +cosy is not an identity
4 answers
asked by
Brandon
2,005 views
if cosA = 4/5; sin <0; cosB = 12/13; 0<B<90, determine sin(A-B)
thanks ... :)
10 answers
asked by
Jonathan
827 views
Find the EXACT value of sin(2A) if cscA=5/4
Assume A is a Quadrant I angle in standard position. sin(2A)=
3 answers
asked by
math
1,075 views
Prove that max & min values of asinx+bcosx are = +/- (a^2+b^2)^1/2
3 answers
asked by
mahesh
2,216 views
Prove that 1-cosx/1+cosx=tan^2x/2
3 answers
asked by
Lohitha
2,587 views
( tanx/1-cotx )+ (cotx/1-tanx)= (1+secxcscx)
Good one! Generally these are done by changing everything to sines and cosines,
1 answer
asked by
mo
1,269 views
tanA - sin A /sin^2A= tan A / 1 + cosA
Please prove this
6 answers
asked by
Venkatesh
3,612 views
please help me.
use trig. identities to find the exact value. tan 25° + tan 5° / 1- tan 25° tan 5°
3 answers
asked by
ann
2,406 views
sin2x-cotx = -cotxcos2x
Using the various trigonometric identities(i.e. double angle formulas, power reducing formulas, half
5 answers
asked by
sam
2,049 views
Prove:
cos4x = 8cos^4x - 8cos^2x + 1 My Attempt: RS: = 4cos^2x (2cos^2x - 1) + 1 = 4 cos^2x (cos2x) + 1 LS: = cos2(2x) =
38 answers
asked by
Anonymous
2,551 views
Angles x and y are located in the first quadrant such that sinx= 4/5 and cosy= 7/25.
determine an exact value for xin(x+Y)
4 answers
asked by
Anonymous
2,148 views
sinA+cosA=p and secA+CosecA=q
then show that q[p^2-1]=2p
5 answers
asked by
kumar
2,721 views
Prove:
tan2x+sec2x = cosx+sinx/ cosx-sinx
4 answers
asked by
Beatriz
4,761 views
Rewrite tan^2x sin^2x in terms of cosine without power greater than one.
Rewrite cot^2〖x/4〗 in terms of cosine
4 answers
asked by
Shanaiah
1,044 views
I need to prove that the following is true. Thanks
(2tanx /1-tan^x)+(1/2cos^2x-1)= (cosx+sinx)/(cosx - sinx) and thanks
3 answers
asked by
abdo
2,526 views
Prove that:
2sinxsiny = cos(x-y) - cos(x+y)
4 answers
asked by
-
1,814 views
1)A piano tuner uses a tuning fork. If middle C has a frequency of 264 vibrations per second, write an equation in the form
3 answers
asked by
Lisa
1,554 views
the expression cos4x cos3x + sin4x sin3x is equivalent to
which one of the following is the answer: 1) sinx 2) sin7x 3) cosx 4)
5 answers
asked by
Rony
3,848 views
12. IF 1/SinA+1/CosA=1/SinB+1/CosB ,PROVE THAT: Cot{(A+B)/2}=TanA.TanB
4 answers
asked by
sanjay
1,874 views
how do you solve: find cos2x if sinx is equal to 1/5
2 answers
asked by
berlyn
591 views
Cos square theta divided by 1-tan theta +sin cube theta divided by sin theta -cos theta = 1+sin theta *cos theta
4 answers
asked by
Anonymous
2,446 views
sorry, another I can't figure out
Show that (1-cot^2x)/(tan^2x-1)=cot^2x I started by factoring both as difference of squares.
3 answers
asked by
mtd
603 views
(Cos/1+cosec) + (sin/ 1+cot ) = sin + cos prove that
1 answer
asked by
Sanjay
396 views
cos(3π/4+x) + sin (3π/4 -x) = 0
= cos(3π/4)cosx + sin(3π/4)sinx + sin(3π/4)cosx - cos(3π/4)sinx = -1/sqrt2cosx +
4 answers
asked by
Kiely
1,606 views
sin45cos25 + cos45sin25 = ??
a. cos70 b. sin70 c. cos20 d. sin 20 which answer is correct ??
4 answers
asked by
Don
358 views
Given that cos a=5/13 and that 270<a>360 evaluate tan a +sin a
7 answers
asked anonymously
49 views
simplify (cos4x-cos2x)/(sin4x+sin2x) the answer choices are : cotx, tanx, cotxtanx, or 1
2 answers
asked by
Scott
954 views
Evaluate sin 7pi/12. Using sum, difference, and cofunction identities
2 answers
asked by
Liv
1,029 views
Prove that: (sinx-2sin2x+sin3x)/(sinx+2sin2x+sin3x)= -tan^2 x/2.
4 answers
asked by
Mahlatse
691 views
Use the cofunction identities to evaluate the expression below
sin^2 21° + sin^2 61° + sin^2 69° + sin^2 29°
2 answers
asked by
elise
793 views
Prove that 2/square root 3cosx-sinx=sec(pi/6-x)
4 answers
asked by
Nathan
2,286 views
Use the sum or difference identity to find the exact value of sin255 degrees.
My answer: (-sqrt(2)- sqrt(6)) / (4) Find the value
2 answers
asked by
Patrick
640 views
tan(θ)/ sec(θ) − cos(θ)
Please help!
2 answers
asked by
Jenn
505 views
Show that cot((x+y)/2) = - (sin x - sin y)/(cos x - cos y) for all values of x and y for which both sides are defined.
I tried
3 answers
asked by
Sam
740 views
If
sin(x) = 1/3 and sec(y) = 13/12 , where x and y lie between 0 and π/2, evaluate the expression using trigonometric
5 answers
asked by
carter
7,484 views
Cos square 30 degree cos square 45 degree + 4 sec square 60 degree + 1/2 cos square 90 degree - 2 tan square 60 degree
7 answers
asked by
trisha
7,632 views
Verify tanxsin2x = 2-2cos^2x
4 answers
asked by
Jake
2,065 views
Prove this identity
1. csc^2(pi/2-x)=1+sin^2xcsc^2(pi/2-x) 2. tan(pi/4+x)+tan(pi/4-x)=2sec2x
4 answers
asked by
Gifty
2,106 views
Find the exact value ofcos (u+v) given that sin u= 7/25 and cos v=−12/13. (Both u and v are in Quadrant II.)
5 answers
asked by
Jessica Maths
4,193 views
given that cot 2 pi/7 = tan z first express 2pi/7 as a different between pi/2 and a angle and then apply a confunction identity
4 answers
asked by
Anonymous
1,789 views
Show that sin(x+pi)=-sinx. Show all of your work.
5 answers
asked by
Allie
2,061 views
Prove that Sin^2(20)+sin^2(40)+sin^2(80)=3/2
4 answers
asked by
Kasumi
1,167 views
If sin(x) = 4cos(x), then what is (sin(x))*(cos (x))?
4 answers
asked by
Katie
4,576 views
Prove identity.
Sec(pi-x)=-sec x
6 answers
asked by
ALISON
7,462 views
For the functions f(x) = sin x, show with the aid of the elementary formula sin^2 A = 1/2(1-cos 2A) that f(x+y) - f(x) = cos x
4 answers
asked by
Anonymous
2,318 views
Someone please help!!!?
7. What is 1/cot(x) in terms of sine? This is what I've got so far: sin = 1/csc tan = 1/cot 1+cot2(x) =
4 answers
asked by
Meg
1,184 views
If sin A = 3/5 and cos B = 24/25 and <A and <B are both in quadrant 1, what is the exact value of cos (A-B) ? Help please
5 answers
asked by
Maryanne
2,226 views
Write the given expression as the cosine of an angle. cos 60° cos 65° − sin 60° sin 65°
4 answers
asked by
terry
1,879 views
If Tan (A+B)=1/3 and Tan(A-B)=2/5,then prove that
A.Tan2A=11/13 B.Tan2B=-1/17
7 answers
asked by
Rabinprakash Dahal
3,334 views
How do I simplify cscx-cotxcosx?
4 answers
asked by
Lauren
2,293 views
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Parent Categories (14)
Algebra
Algebraic Simplification
Basic Trigonometric Functions
Calculus
Cosine and Sine
Functions
Functions and Formulas
Mathematics
Simplifying expressions
Tangent
Tangent Function
Trigonometric Equations
Trigonometric Functions
Trigonometry