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Nicotine6996
@Nicotine6996
August 2022
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доказать тождество cos12-cos48=sin18
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mikael2
Verified answer
Cosα-cosβ=-2sin(α+β/2)sin(α-β/2)
cos 12-cos48=-2sin30sin(-18)=2*1/2sin18=sin18
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Nicotine6996
спасибо огромное)
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Verified answer
Cosα-cosβ=-2sin(α+β/2)sin(α-β/2)cos 12-cos48=-2sin30sin(-18)=2*1/2sin18=sin18