Resposta :
sen (45-30) + cos (45-30) =
sen 45 . cos 30 + sen 30 . cos 45 + cos 45 . cos 30 - sen 45 . sen 30 =
\/2/2 . \/3/2 + 1/2 . \/2/2 + \/2/2 . \/3/2 - \/2/2 . 1/2 =
\/6/4 + \/2/4 + \/6/4 - \/2/4 =
2\/6/4 = \/6/2
calcular seno 15° + cos 15° obs: resultado (√6/4 -√2/4) +( √6/4 + √2/4) , porem com faço para calcular soma dessas raizes?
sen (45-30) + cos (45-30) =
sen 45 . cos 30 + sen 30 . cos 45 + cos 45 . cos 30 - sen 45 . sen 30 =
\/2/2 . \/3/2 + 1/2 . \/2/2 + \/2/2 . \/3/2 - \/2/2 . 1/2 =
\/6/4 + \/2/4 + \/6/4 - \/2/4 =
2\/6/4 = \/6/2