Question

Jika Tan alpha = 3/4 dengan Sudut Lancip Hitunglah Sin 2 alpha?

Answer 1

Verified answer

Tan a = y/x = 3/4
r = √(x² + y²)
r = √(3² + 4²)
r = √(9 + 16)
r = √25
r = 5

sudut lancip --> sin dan cos (+)

sin a = y/r = 3/5
cos a = x/r = 4/5

sin 2a = 2 sin a cos a = 2 . 3/5 . 4/5 = 24/25