化简:sin^A*sin^A+sin(A-60°)*sin(A-60°)+sin(A+60°)*
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化简:sin^A*sin^A+sin(A-60°)*sin(A-60°)+sin(A+60°)*化简:sin^A*sin^A+sin(A-60°)*sin(A-60°)+sin(A+60°)*化简:s
化简:sin^A*sin^A+sin(A-60°)*sin(A-60°)+sin(A+60°)*
化简:sin^A*sin^A+sin(A-60°)*sin(A-60°)+sin(A+60°)*
化简:sin^A*sin^A+sin(A-60°)*sin(A-60°)+sin(A+60°)*
sin^2 A + sin^2 (A + 60 °) + sin^2 (A - 60 °)
= sin^2 A + (1 - cos2 (A + 60 °))/2 + (1 - cos2 (A - 60 °))/2
= sin^2 A + 1 -
1/2*2 cos (2 A + 120 ° + 2 A - 120 °)/2 cos (
2 A + 120 ° - 2 A + 120 °)/2
= sin^2 A + 1 - cos2Acos120
= sin^2 A + 1 + 1/2 cos2A
= sin^2 A + 1 + cos^2 A - 1/2
= 3/2
sin^2(-a)化简
sin a-sin b等于
化简:sin^A*sin^A+sin(A-60°)*sin(A-60°)+sin(A+60°)*
化简tan a(cos a-sin a)+sin a(sin a+tan a)/1+cos a
化简sin a+cos a
化简:sin(-a)cos(2π+a)sin(-a-π)
化简Sin A + Sin 2A / 1+cos A +
化简sin^(a-30°)+sin^(a+30°)-sin^a化简sin^2(a-30°)+sin^2(a+30°)-sin^2a
sin(a-15)=-sin(15-a)?
化简sin(A+π/4)sin(A-π/4)/sin^4A-cos^4A
化简（sin(a+30)+sin(30-a)）/cosa得
化简sin(4π-a)*sin(5π-a)=?
化简:sin(a-pai/4)*sin(a+pai/4)
化简sin(π/4+a)+sin(π/4-a)
化简sin(-A-2派)
化简sin(2π+a)
化简（sin(a-b)-2sin a cos b）/2sin a sin b +coa(a+b)
(1-sin^4a-cos^4)/(sin^2a-sin^4a) 化简