sin a = 12/13 , 0 ≤ a ≤ 90° sin 2a = ... mohon bantuannya :)

sin A = 12/13
√13^2 - 12^2 = √169 - 144 = √25 = 5

cos A = 5/13

Sin 2A = 2 sin A cos A
= 2 x 12/13 x 5/13
= 120 / 169