11. Simplify the expression tanx-sinx sinx A. tanx-1 B. cos x-1 C. secx-1 D. sinx-1 cos2A 12. Evaluate the expression sin A+ 1+sinA

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A: This question can be solved using the concept of differentiation of trigonometric functions.

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A:

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A: Given that: ∫tan5(7x+1).sec3(7x+1)dx

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A: Using Cos(A+B) formula

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A: Topic = Trigonometry    using formulascos 2x = 1-2 sin2xcos 2x = 2 cos2x - 1

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A: The given trigonometric equation (identity) is: cos2x-sin2x=1-2sin2 x To verify this, take the left…