trig
posted by Sarah .
Prove tanAsin2A=2sin^2a

LS
= (tanA)(sin2A)
= sinA/cosA(2sinAcosA)
= 2sin^2 A
= RS
Respond to this Question
Similar Questions

Math  Trig  Double Angles
Prove: sin2x / 1  cos2x = cotx My Attempt: LS: = 2sinxcosx /  1  (1  2sin^2x) = 2sinxcosx /  1 + 2sin^2x = cosx / sinx  1 = cosx / sinx  1/1 = cosx / sinx  sinx / sinx  Prove: 2sin(x+y)sin(xy) = cos2y  cos2x My Attempt: … 
Math  Solving Trig Equations
Solve each equation for 0 is less than and equal to "x" is less than and equal to 360 3sinx = 2cos^{2}x  I don't know how to solve this equation...this is what I have, but I don't know if I'm on the right track or not 3sinx = … 
trig
2sin(x)cos(x)+cos(x)=0 I'm looking for exact value solutions in [0, 3π] So I need to find general solutions to solve the equation. But do I eliminate cos(x), like this... 2sin(x)cos(x)+cos(x)=0 2sin(x)cos(x)= cos(x) 2sin(x) = … 
trig
What kind of reflections are the following trig functions? 
trig
What is the shift along x of the following trig functions? 
trig
1. 3cot^2 (x)  1 = 0 My answer: pi/3, 2pi/3, 4pi/3, 5pi/3 2. 4cos^2 (x)  1 = 0 My answer: pi/3, 2pi/3, 5pi/3, 4pi/3 3. 2sin (x) + csc (x) = 0 My answer: unknown lol i got to the part: sin^2 (x) = 1/2 4. 4sin^3 (x) + 2sin^2 (x)  … 
trig
Prove the identity. (must work with left side) (12sin(x)^2)=(cos(x)^2) 
Math
Prove :cosxcosy= 2sin(x+y/2)sin(xy/2) Prove: 2cot2tanx= 42sec^2x / tanx 
trig
prove that: sinC+sinD =2sin((C+D)/2)*cos((CD)/2) 
trig
prove that the equation 2sin x cos x +4cos^2 x =1 may be written in the form of tan^2 x 2tan x 3=0