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The value of sin2 65° + sin2 25° is ______. - Mathematics

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Question

The value of sin2 65° + sin2 25° is ______.

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Solution

The value of sin2 65° + sin2 25° is ______.

Explanation:

sin2 65° + sin2 25°

= sin2 65° + {sin 25°}2

= sin2 65° + {sin (90° – 65°)}2

= sin2 65° + cos2 65°   ...[∵ sin(90° – θ) = cos θ]

= 1   ...[∵ sin2θ + cos2θ = 1]

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2019-2020 (March) Basic - Delhi set 2
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