how to solve these? a) cost = −5/13 , and π/2 < t < π b) sint = −7/25 , and cost > 0 c) tant = −12/5, and sint < 0

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A:

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A: Drawing the given triangle ABC

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A: The detailed solution is given below Thank you The second option is true

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A: Given query is to find the value of indicated trigonometric function.

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A: Explanation of the answer is as follows

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A: To find the value of x and y.

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Q: =?

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A: Pythagoras Theorem is used.

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A: The objective of the question is evaluation.

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A: we have to prove the formula.

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A:

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A: From the trigonometry we have tanθ=HeightBasesee below the answer and explanation

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A: answer is in next step

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Q: 4) (-7k+10 ) (k- 1)

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A: We have to prove the given trigonometric relation .

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A: Use Trigonometric ratios concept

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A: We will find the equation of the graph.

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A: Given query is to find the value of trigonometric functions.

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A: To divide the following expression.n2+10n+18÷n+5

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A: The given expression,       cos2tan-115

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