Matrix & Mathematical Induction (Worked Example)

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In fact can we just apply sin(a ± b) = (sin a)(cos b) ± (cos a)(sin b) directly when we simplify the answer of the multiplication?

chungcf
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why is the condition 0 < Ɵ < 180 given?

ahmedabdelmegeed
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No, I haven't the slightest clue. If I find out, I'll share it with you.

ahmedabdelmegeed
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If Ɵ not lies on Quadrant I and II, sin Ɵ will be negative

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