# trig

Prove tanAsin2A=2sin^2a

1. 👍
2. 👎
3. 👁
1. LS
= (tanA)(sin2A)
= sinA/cosA(2sinAcosA)
= 2sin^2 A
= RS

1. 👍
2. 👎

## Similar Questions

1. ### AP Calculus Help Five Questions

1. Find the particular solution to y " = 2sin(x) given the general solution y = -2sin(x) + Ax + B and the initial conditions y(pi/2) = 0 and y'(pi/2) = -2. 2. What function is a solution to the differential equation y ' - y = 0?

2. ### Pre-Calculus

Solve the equation on the interval [0,2pi). 2sin^2x-3sinx+1=0 (2sinx+1)(sinx+1) I don't think I did the factoring correctly. When I multiply it out to double check I get 2sin^2x+3sinx+1

3. ### trigonometry

1) what is the phase shift of f(x) = -2sin(3x-pi)+1 2) What is the period of f(x) = -2sin(3x-pi)+1

4. ### advanced function

pls. help: prove the identity sin2x+sin2y=2sin(x+y)cos(x-y)

1. ### Calculus

Find the length of the curve correct to four decimal places. (Use a calculator to approximate the integral). r(t) = (cos π t, 2t, sin 2πt), from (1, 0, 0) to (1, 4, 0) This what I did. r'(t)=-πsin(πt),2,2πcos(2πt)

2. ### 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(x-y) = cos2y - cos2x My

3. ### Math:)

A weight is attached to a spring that is oscillating up and down. it takes 3 sec. for the spring to complete one cycle, and the distance from the highest to lowest point is 4 in. What equation models the position of the weight at

4. ### Discrete Math

Prove that for all positive integers “a” and “b”, GCD(a,b) = LCM(a,b) iff a = b. Can someone explain me how to prove this? I'm confused. This is for Discrete Math.

1. ### Math

Prove this using direct proof in paragraph form Given:M is the midpoint of XY Prove: XM=YM

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

3. ### Boundedness of a Sequence

Question : How do we prove that the sequence (1+(1/n))^n is bounded? My thoughts on this question : We know that, to prove a sequence is bounded, we should prove that it is both bounded above and bounded below. We can see that all

4. ### Trigonometry

Prove that cos(A+B) + sin(A-B) = 2sin(45°+A)cos(45°+B)