Question

Sin 15° Cos 15° - Cos 75° Sin76°

Answer 1

Sin 15 cos15 - cos75 sin 75
=Sin(90-75) cos(90-75) - cos75 sin 75
=cos75 sin 75 - cos75 sin 75
=0

Answer 2

Hi friend,

Sin 15° Cos 15° = 0.25
Because Sin 15° = 0.259
Cos 15° = 0.966

Cos 75° Sin 76° = 0.251
Because Cos 75° = 0.259
Sin 76° = 0.970

Therefore,
Sin 15° Cos 15° - Cos 75° Sin76° = 0.25 - 0.251
= -0.001
≈ 0

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