1+sin(a-360)cos(a-270)-2cos^2 a
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1+sin(a-360)cos(a-270)-2cos^2a1+sin(a-360)cos(a-270)-2cos^2a1+sin(a-360)cos(a-270)-2cos^2a1+sin(a-36
1+sin(a-360)cos(a-270)-2cos^2 a
1+sin(a-360)cos(a-270)-2cos^2 a
1+sin(a-360)cos(a-270)-2cos^2 a
1+sin(a-360)cos(a-270)-2cos^2 a
=1+[-sin(360-a)][-cos(270-a)]-2cos^2 a
=1+[-(-sina)][-(-sina)]-2cos^2 a
=1+(sina)^2-2cos^2 a
=(sina)^2-cos2a
=(1-cos2a)/2-cos2a
=(1-3cos2a)/2
化简tan a(cos a-sin a)+sin a(sin a+tan a)/1+cos a
求证1+sin a+cos a+2sin acos a/1+sin a+cos a=sin a+cos a
求证:sin 2a/1+sin a+cos a=sin a+cos a-1急
sin^2(a+pai)-cos(pai+a)*cos(-a)+1
利用三角函数定义证明cos a-sin a+1/(cos a+sin a+1)=1-sin a/cos a
证明(cos a-sin a+1)/(cos a+sin a+1)等于(1-sin a)/cos a
证明Cos^A-Sin^A=1-2Sin^A=2Cos^A-1=cos^a-sin^a
sin平方A+cos平方A+sin A+cos A-1/sin平方A-cos平方A怎么计算
求证:sin a (1+cos2a)=sin a cos a
化简Sin A + Sin 2A / 1+cos A +
(sin a)/(1+cos a)=(1-cos a)/sin a怎么证sin a 1-cos a------ = -----------1+cos a sin a
求证 1+sin a+cos a+2sin a*cos a/1 +sin a +cos a = sin a+ cos a 有什么思路!
cos(180+A)*sin(A+360)/sin(-A-180)*cos(-180-A)答案是1还是-1
化简:1+sin(a-360°)cos(a-270°)-2cos^2a=
1+sin(a-360)cos(a-270)-2cos^2 a
化简 [sin(-a)-sin(900-a)]/[]tan(a-360)-cos(180+a)-cos(-a-360)]
证明恒等式tan a*sin a/tan a-sin a=1+cos a/sin a
sin 2a+2sin方a/ 1+tan a =2sin a cos a