charlie-clark_60c20bdd8b9ea
charlie-clark_60c20bdd8b9ea
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sabemos que cos²(x) + sen²(x) = 1 basta encontrar sen²(x) = sen(2x) sabemos também que sen(a+b) = sen(a)cos(b) + cos(a)sen(b) então sen(2x) = sen(x+x) = sen(x)cos(x) + sen(x)cos(x) =2sen(x)cos(x) logo sen²(x) = 2sen(x)cos(x) =…