find the range of cos2x +3 sinx
Kindly refer the similar link for your query.
https://www.meritnation.com/ask-answer/question/what-is-the-range-of-f-x-cos2x-sin2x/sets/10194695
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https://www.meritnation.com/ask-answer/question/what-is-the-range-of-f-x-cos2x-sin2x/sets/10194695
Regards