Problem

$=1$
If $sin$ theta $+sin^{n}2theta=$
$+cos^{n}4theta=$
Prove that cos^2theta $+cos^{n}4t$

Calculus

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Solution

Qanda teacher - priyanka

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$11$ Prove that $cos^{2}\dfrac {\pi } {8}+cos^{2}\dfrac {3\pi } {8}+cos^{2}\dfrac {5\pi } {8}+cos^{2}\dfrac {7\pi } {8}=2$
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10th-13th grade

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$2$

10th-13th grade

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