Matematică
frany
2016-04-12 11:50:57
calculati sin30 grade x cos60 grade +cos 30 grade x sin 60 grade pls urgent
Răspunsuri la întrebare
Laura19
2016-04-12 14:42:39

sin(30°)•cos(60°)+cos(30°)•sin(60°)= [latex]=dfrac{1}{2}cdotdfrac{1}{2}+dfrac{sqrt{3}}{2}cdotdfrac{sqrt{3}}{2}=[/latex] [latex]=dfrac{1}{4}+dfrac{3}{4}=[/latex] [latex]=dfrac{4}{4}=[/latex] [latex]=1[/latex]

fata4
2016-04-12 14:43:54

sin 30° × cos60° = 1/2 × 1/2 = 1/4  cos30° × sin60° = √3/2 × √3/2= 3/4 suma acestora va fi ... 1/4 + 3/4 = 4/4 = 1 !!!

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