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Question
sin 43° cos 47° + cos 43° sin 47° = ?
Options
0
1
sin 4°
cos 4°
MCQ
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Solution
1
Explanation:
Given expression = sin 43° cos (90° – 43°) + cos 43° sin (90° – 43°)
= sin 43° · sin 43° + cos 43° · cos 43°
= sin2 43° + cos2 43°
= 1
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