sin(负1071度)乘sin99度加sin(负171度)乘sin(负261度)
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sin(负1071度)乘sin99度加sin(负171度)乘sin(负261度)
sin(负1071度)乘sin99度加sin(负171度)乘sin(负261度)
sin(负1071度)乘sin99度加sin(负171度)乘sin(负261度)
sin(-1071°)sin99°+ sin(-171°)sin(-261°)
= (-sin351°)sin99° + sin(171°)sin(261°)
= -sin9°sin81°+sin9°sin81°
=0
0
sin(负1071度)乘sin99度加sin(负171度)乘sin(负261度)
sin(-1071度)×sin99度+sin(-171度)sin(-261度)化简
化简(1)sin(-1071度).sin99度+sin(-171度).sin(-261度)
sin(-1071)×sin99+sin(-171)×sin(-261)等于?
sin(-351度)sin99度+sin171度sin261度=
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