8. Introduction to Trigonometry
easy

$\sin ^{2} 15+\sin ^{2} 75=\ldots \ldots \ldots \ldots$

A

$1$

B

$0$

C

$2$

D

$6$

Solution

$\sin ^{2} 15+\sin ^{2} 75=\sin ^{2} 15+\sin ^{2}(90-15)$

$=\sin ^{2} 15+\cos ^{2} 15$

$=1$

Standard 10
Mathematics

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