问题
解答题
化简:(1)6sin(-90°)+3sin0°-8sin270°+12cos180° (2)mtan0+ncos
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答案
(1)6sin(-90°)+3sin0°-8sin270°+12cos180°=-6+0-8(-1)+12(-1)=-10.
(2)mtan0+ncos
-psinπ-qcosπ 2
-rcos2π=0+0-0-0-r×1=-r.3π 2
化简:(1)6sin(-90°)+3sin0°-8sin270°+12cos180° (2)mtan0+ncos
|
(1)6sin(-90°)+3sin0°-8sin270°+12cos180°=-6+0-8(-1)+12(-1)=-10.
(2)mtan0+ncos
-psinπ-qcosπ 2
-rcos2π=0+0-0-0-r×1=-r.3π 2