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kiril96
@kiril96
August 2021
1
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cos 64°×cos19°+sin19°×sin 64°
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lara164
Verified answer
=1/2(cos(64+19)+cos(64-19))-1/2(cos(64+19)-cos(64-19))=1/2(cos83+cos45-cos83+cos45)=cos45=√2/2
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Verified answer
=1/2(cos(64+19)+cos(64-19))-1/2(cos(64+19)-cos(64-19))=1/2(cos83+cos45-cos83+cos45)=cos45=√2/2