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story12
@story12
October 2021
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Решите пожалуйста,
cos 70°× cos 10° + sin 10°×sin 70°
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Verified answer
cos 70°× cos 10° + sin 10°×sin 70° = cos (70
°–10°)=cos 60°= 1/2
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Verified answer
cos 70°× cos 10° + sin 10°×sin 70° = cos (70°–10°)=cos 60°= 1/2