Solana1949274ask
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Calculati: sin30×cos60+sin60×cos30
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Răspuns:

1/2 • 1/2 + √3/2 • √3/2 = 1/4 + 3/4 = 4/4 = 1

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GreenEyes71ask

Salut,

[tex]sin30^{\circ}\cdot cos60^{\circ}\cdot sin60^{\circ}\cdot cos30^{\circ}=\dfrac{1}2\cdot\dfrac{1}2+\dfrac{\sqrt3}2\cdot\dfrac{\sqrt3}2=\\\\=\dfrac{1}4+\dfrac{3}4=\dfrac{1+3}4=\dfrac{4}4=1.[/tex]

Green eyes.

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