jika sin2a = p ,maka cos2x = a.p2 b. 1 -p2 c. akar 1 -p2 d. 1 -p e 1 +p pleasee

Bab Trigonometri
Matematika SMA Kelas X

sin 2a = p/1 → y/r

x = √(r² - y²)
x = √(1 - p²)

cos 2a = x/r = (√(1 - p²))/1 = √(1 - p²)

jawabannya C