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The real roots of the equation cos^7x+si...

The real roots of the equation `cos^7x+sin^4x=1` in the interval `(-pi,pi)` are __________, ________, and ________

A

`-pi//2,0`

B

`- pi//2, 0, pi//2`

C

`pi//2,0`

D

`0,pi//4,,pi//2`

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The correct Answer is:
B
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ML KHANNA-TRIGONOMETRICAL EQUATIONS -SELF ASSESSMENT TEST
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  12. Let P= {theta : sin theta - cos theta = sqrt2 cos theta} and Q =...

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  16. The number of values of theta in the interval (-(pi)/(2), (pi)/(2)) su...

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