Jika tan 2A=2P/1-p2,maka sin 2A adalah....

TRIgonomeTRI

tan 2A = 2p/(1 - p²)
tan 2A = 2tan A /(1 - tan² A)

tan A = y/x = p = p/1
r = √(p² + 1²) = √(1 + p²)

sin 2A
= 2 sin A cos A
= 2 . y/r . x/r
= 2xy/r²
= 2 . 1 . p/(1 + p²)
= 2p/(1 + p²)