2x^3 + x - 1 + x^2 - 3x = 2x^3 + x^2 - 2x - 1
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1) 68921
2) 195112
Вот ответ
sin(x-y)=sinxcosy-sinycosx
2sin15°+cos45°=2sin(60°-45°)+cos45°=
=2sin60°cos45°-2sin45°cos60°+cos45°=
=2×(√3/2)×(√2/2) - 2×(√2/2)×1/2 + (√2/2)=
=2×(√6/4) -(√2/2) + (√2/2)=2(√6/4)=√6/2