trigonometry

Question: If $\sin x+{{\sin }^{2}}x=1,$then ${{\cos }^{8}}x+2{{\cos }^{6}}x+{{\cos }^{4}}x=$

1) 0

2) – 1

3) 2

4) 1

Solution:

Explanation: No Solution

Fundamental trigonometrical ratios and functions Trigonometrical ratio of allied angles

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