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vus2
@vus2
August 2021
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вычислить:sin18-sin54
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lizaliza121
Sin 54- sin 18 = 2 sin (54-18 /2) *cos (54+18)/2=2 *sin18*cos72=2 sin^2(18)=1-cos36=
=1-(1+√5)/4
=(3-√5)/4
=3/4-√5/4
3 votes
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Answers & Comments
=1-(1+√5)/4
=(3-√5)/4
=3/4-√5/4