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Some Applications Of Trigonometry

Question

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If A, B, C are interior angles of a ΔABC, show that
(i) $sin space fraction numerator straight B plus straight C over denominator 2 end fraction equals space cos straight A over 2.$
(ii) $cos fraction numerator straight B plus straight C over denominator 2 end fraction equals sin straight A over 2.$

Solution

Solution not provided.

Some More Questions From Some Applications of Trigonometry Chapter

In ΔABC, right angled at B. AB = 24 cm, BC = 7 cm. Determine:
(i) sin A cos A,
(ii) sin C, cos C.

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