20) If 8 is an angle with terminal side in 4th quadrant such thatv tan 9 = a) O b) O c) O d) O then sec 0 is equal to :

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A: See this solution in below

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A: topic- implicit differentiation

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A: According to the company rule we can answer only first question and rest can be reposted.

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A: A detailed solution is given below.

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A: Topic = Derivative

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A: I am attaching image so that you understand each and every step.

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