3 and 90°

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A: We will use Cosine rule of triangle to solve this

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A: This question is based on trignometric ratios.

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A: NOTE: Refresh your page if you can't see any equations. . here we have arc=21 radius=8

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A: Let's integrate. 

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A: The objective is to check which values are in the range of the given circular function. 

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A: Simplification 

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A: Please refer to the image below

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A: NOTE: Refresh your page if you can't see any equations. . compare this equation with a standard eq...

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A: we know that  sin2x +cos2x =1

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