sin(6y) sin(8y) dy.

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A:

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A:

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A:

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A: We will use substitution method to integrate.

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A:

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A: For the given Definite integral is evaluate by using change of variable method as shown below

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A: “Since you have asked multiple question, we will solve the first question for you. If you  want any…

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A:

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A: Given

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A: According to the trigonometric hyperbolic formula: tanh(x)=sinh(x)cosh(x)        ...(i) Distributive…

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A: Explanation of the answer is as follows

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A: Given below the detailed solution