Question

cos(2x) = q/r and sin(2x) = p/r
if x is between 0 and pi/4, then find an expression for tan(x) and show that it is a rational no.

Answer 1

tan2x = p/q = (2 tanx / (1-tan^2 x))
solve for tan x

i dont know really,,but this should work..

Answer 2

and how do we solve that??

Answer 3

This question same as other one, only in algebra

Answer 4

use half angle formula, not double angle

Answer 5

it'll give you a quadratic eqn in tanx