Question

cos (A+B)=cosA cosB-sinA sinB find (
$\pi \div 2 - thetha$
​

Answer 1

Answer:

- sin∅

Step-by-step explanation:

We know

Cos( A+ B) = CosA. CosB - SinA. SinB

Cos ( π/2 + ∅) = Cosπ/2 cos ∅ - Sin π/2 . sin ∅

Cos ( π/2 + ∅) = - Sin ∅

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