求值:sin(π/4)cos(19π/6)tan(21π/4)急!
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求值:sin(π/4)cos(19π/6)tan(21π/4)急!求值:sin(π/4)cos(19π/6)tan(21π/4)急!求值:sin(π/4)cos(19π/6)tan(21π/4)急!1
求值:sin(π/4)cos(19π/6)tan(21π/4)急!
求值:sin(π/4)cos(19π/6)tan(21π/4)急!
求值:sin(π/4)cos(19π/6)tan(21π/4)急!
12个 (π/6)(30度 )构成圆心角一圈360度 , 所以(19π/6)可以化简成 7π/6
8个(21π/4)(45度)构成圆心角一圈360度,所以(21π/4)可以化简成 5π/4
sin(π/4)cos(19π/6)tan(21π/4)
={(根号2)/2}×cos{7π/6}×{tan5π/4}
={(根号2)/2}×cos{210度}×tan225度
={(根号2)/2}×{-(根号3)/2}×1
=2.449
求值:sin(π/4)cos(19π/6)tan(21π/4)急!
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