diketahui nilai tan 36° = p. hasil sin 36°× cos 36° =..

Bab Trigonometri
Matematika SMA Kelas X

tan 36° = p = p/1 = y/x

r = √(x² + y²)
r = √(1² + p²)
r = √(1 + p²)

sin 36° . cos 36°
= y/r . x/r
= p/√(1 + p²) . 1/√(1 + p²)
= p/(1 + p²)