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The value of sin 23° cos 67° + cos 23° sin 67° is ______. - Mathematics

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Question

The value of sin 23° cos 67° + cos 23° sin 67° is ______.

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Solution

The value of sin 23° cos 67° + cos 23° sin 67° is 1.

Explanation:

sin 23° cos 67° + cos 23° sin 67°

= sin 23° cos (90° – 23°) + cos 23° sin (90° – 23°)

= sin 23° sin 23° + cos 23° cos 23°

= sin2 23° + cos2 23°

= 1   ...[sin2A + cos2A = 1]

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