Question

Evaluate:-
$\tt{\frac{ \sin ^{2}63 \degree +\sin ^{2}25 \degree }{\cos ^{2}17 \degree +\cos ^{2}73 \degree}}$
​

Answer 1

Answer:

Correct option is

A

1

Given, cos217+cos273sin263+sin227=cos2(17)+(cos(90−17))2sin263+(sin(90−63))2

As we know

90−63=27

90−17=73

from (sin(90−63)=cos63, cos(90−17)=sin17,

Now,

cos217+cos273sin263+sin227=cos2(17)+(cos(90−17))2sin263+(sin(90−63))2=cos217+sin217sin263+cos263    

=11=1               ∵sin

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

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