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What are the ratios for sin A and cos A? The diagram is not drawn to scale. Triangle Description AB = 29 AC = 20 BC  21 A. sin A = 20/29, cos A = 21/29 B. sin A = 21/29, cos A = 20/21 C. sin A = 21/29, cos A = 20/29****? D. sin
asked by Battia Anne on June 7, 2016 
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
asked by Binoy kumar mahato on October 6, 2017 
Math  Trig  Double Angles
Prove: cos4x = 8cos^4x  8cos^2x + 1 My Attempt: RS: = 4cos^2x (2cos^2x  1) + 1 = 4 cos^2x (cos2x) + 1 LS: = cos2(2x) = 2cos^2(2x)  1 = (cos^2(2))  cos^2(2x))  1  Prove: 8cos^4x = cos4x + 4cos2x + 3 My Attempt: RS: =
asked by Anonymous on November 17, 2007 
Trig
Find sin(s+t) and (st) if cos(s)= 1/5 and sin(t) = 3/5 and s and t are in quadrant 1. =Sin(s)cos(t) + Cos(s)Sin(t) =Sin(1/5)Cos(3/5) + Cos(1/5)Sin(3/5) = 0.389418 Sin(st) =sin(s)cos(t)  cos(s)sin(t) =sin(3/5)cos(1/5) 
asked by Sally on May 7, 2015 
Calculus 12th grade (double check my work please)
1.)Find dy/dx when y= Ln (sinh 2x) my answer >> 2coth 2x. 2.)Find dy/dx when sinh 3y=cos 2x A.2 sin 2x B.2 sin 2x / sinh 3y C.2/3tan (2x/3y) D.2sin2x / 3 cosh 3yz...>> my answer. 2).Find the derivative of y=cos(x^2) with
asked by anon on March 6, 2011

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 +
asked by hayden on February 23, 2009 
Pre Calculus
Multiply; then use fundamental identities to simplify the expression below and determine which of the following is not equivalent. (sin x + cos x) ^2 a. 1+2sinxcosx b. sec^2x−tan^2x+2cosxsinx c.sec x + 2 sin x/sec x d.
asked by Jessica Maths on July 11, 2016 
Mathematics  Trigonometric Identities
Let y represent theta Prove: 1 + 1/tan^2y = 1/sin^2y My Answer: LS: = 1 + 1/tan^2y = (sin^2y + cos^2y) + 1 /(sin^2y/cos^2y) = (sin^2y + cos^2y) + 1 x (cos^2y/sin^2y) = (sin^2y + cos^2y) + (sin^2y + cos^2y) (cos^2y/sin^2y) =
asked by Anonymous on November 8, 2007 
precalculus
For each of the following determine whether or not it is an identity and prove your result. a. cos(x)sec(x)sin^2(x)=cos^2(x) b. tan(x+(pi/4))= (tan(x)+1)/(1tan(x)) c. (cos(x+y))/(cos(xy))= (1tan(x)tan(y))/(1+tan(x)tan(y)) d.
asked by anonymous on April 14, 2013 
Trigonometry  Identities
If tan 2x =  24/7, where 90 degrees < x < 180 degrees, then find the value of sin x+ cos x. I applied various identities and tried manipulating the problem to get sin x + cos x = sin(arctan(24/7)/2) + cos(arctan(24/7)/2) I also
asked by Sam on November 14, 2013 
Precalculus
Prove the following identities. 1. 1+cosx/1cosx = secx + 1/secx 1 2. (tanx + cotx)^2=sec^2x csc^2x 3. cos(x+y) cos(xy)= cos^2x  sin^2y
asked by Liv on November 18, 2016
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