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Iustii52
a fost răspuns

Calculați:
a)sin30°cos60°+sin60°cos30°
b) cos60°cos30°-sin60°sin30°
c)sin60°-2sin30°cos30°

Răspuns :

Slavitescudora
a) 1/2×1/2+√3/2×√3/2=1/4+3/4=4/4=1
b) 1/2×√3/2-√3/2×1/2=√3/4-√3/4=0
c) √3/2-2×1/2×√3/2=√3/2-√3/2=0

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