cos(-1109°) tan(-19π /3)分别是第几象限 他们分别的符号?

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cos(-1109°) tan(-19π /3)分别是第几象限 他们分别的符号?
cos(-1109°) tan(-19π /3)
分别是第几象限 他们分别的符号?

cos(-1109°) tan(-19π /3)分别是第几象限 他们分别的符号?
-1109+1440=331,四,+
-19π /3+6π=-π/3,四,-
你也应该自己做做才好…………

cos(-1109°) tan(-19π /3)分别是第几象限 他们分别的符号? tan(-2010°)+cos(-79π/6) 【sin330°*tan(-13π/3)】/【cos(-19π/6)*cos690°】 [sin330°-tan(-13π/3)]/[cos(-19π/6)-cos690°] cos(19π/6)+tan(16π/3)=? sinπ+cos+(-π)+tanπ过程. 化简:sin²(α+π)cos(-α+π)/tan(α+π)tan(α+2π)cos²(-α-π)1.cos(27°+α)cos(33°-α)-sin(27°+α)sin(33°-α) 2.sin²(α+π)cos(-α+π)/tan(α+π)tan(α+2π)cos²(-α-π) 计算cosπ/3-tanπ/4+3/4tan²π/6-sinπ/6+cos²π/6cosπ/3-tanπ/4+3/4tan²π/6-sinπ/6+cos²π/6[tan(-150°)cos(-210°)cos420°]/cot(-600°)sin(-1050°)cos25/6π+cos25/3π+tan(-25/4π)5sinπ/2+2cos0-3sin3/2π+10cosπtan10°t 计算(1)cosπ/3-tanπ/4+3/4tan²π/6-sinπ/6+cos²π/6cosπ/3-tanπ/4+3/4tan²π/6-sinπ/6+cos²π/6[tan(-150°)cos(-210°)cos420°]/cot(-600°)sin(-1050°)cos25/6π+cos25/3π+tan(-25/4π)5sinπ/2+2cos0-3sin3/2π+10cosπt 化简:(1)sin(-α+180°)-tan(-α)+tan(-α+360°)/tan(α+180°)+cos(-α)+cos(α+180°)(2)sin^2(α+π)cos(-α+π)/tan(α+π)+tan(α+2π)cos^3(-α-π) sin(21π -a)+cos(4.5π -a)+tan(2.25π-a)-sin(-a-19π)-cos(-a-13.5π)-tan(-a-1.75π) tan(-150°)cos(-210°)cos(-420°)tan(-600°)/sin(-1050°) 计算 tan 30°+cos 30°/tan 45°-cos 60° 等于多少 cos^(50°+α)+cos^(40°-α)-tan(30°-α)*tan(60°+α) 计算 tan 30°+cos 30°/tan 45°-cos 60= Sinπ/3Tanπ/3+tanπ/6COSπ/6-Tanπ/4COSπ/2 [cos(α-π)*cos(19/2*π-α)]/[sin(π/2-α)* tan[(2k+1)π+α]] 求证cos(720°+α)(2/cosα+tanα)(1/cosα-2tanα)=2cosα-3tanα