Question

sin 72 cos 42 - cos 72 sin 42 =1/2​

Answer 1

Step-by-step explanation:

sin (x - y) = sinx cosy - cosx siny

Misalkan :

- x = 72

- y = 42

sin 72 cos 42 - cos 72 sin 42

= sinx cosy - cosx siny

= sin (x - y)

= sin (72 - 42)

= sin 30

= 1/2

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