Question

求三角函数的值 1.sin(-10π/3) 2.tan（-855度）

Answer 1

1、sin(-10π/3)＝sin(-10π/3＋4π)＝sin(2π/3)＝sin(π－π/3)＝sin(π/3)＝√3/2

2、tan(－855º)＝tan(5×180º－855º)＝tan45º＝1