14. Use appropriate double angle formulas to rewrite sin* in terms of the first power of the cosine. (a)(1-2 cos 20+ cos² 20) (b)(3+4 cos 20 + cos 40) (c)(1+2 cos 20+ cos² 20) (d) b and c are correct (e) none of these

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A: To determine the exact value of the expression.

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Q: The Equivalent expression of cos (4 A) is

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A: Given that: (Sin²30°+cos²30°+sin²45°+cos²45°)²

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Q: 9. Determine the correct simplification of the expression (1 + cose)(1- cose).

A: SOLUTION-

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Q: 2 sin- If p = cos -1 q, show that 4p? – 4pt + q? = 1.

A: