Sin 35° × sin 55° - cos 35° × cos 55°
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Answer:
- cos 20°
Step-by-step explanation:
N = Sin 35° × sin 55° - cos 35° × cos 55° = - ( coc 35° cos 55° - sin 35° sin55° )
= - cos ( 35° - 55°) = - cos - 20° = - cos 20°
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