2022-11-08 19:31
过程与结果如图所示
=sin(4π+π/6)
=sin(π/6)
=1/2,
sⅰn(13π/3)
=sin(4π+π/3)
=sin(π/3)
=√3/2,
∴sin(25π/6)
2、(1)当x=2kπ+π/2时,
y=2sinx有最大值,最大值y=2
当ⅹ=2kπ一π/2时,y=2sinⅹ有最小值,最小值y=一2,
(2)当x=2kπ一π/2时,
y=一4sinx有最大值4,
当x=2kπ+π/2时,
y=一4sinx有最小值一4。