常用三角公式 ()expG8)-cos8+jsin日 (2)cosxx 方epG0)-ep附0y (3)sm0= (④)sin26+cos201 (5)cos0-sin20=cos (20) (6cos20-号+cs(20)1 (⑦)sim20-21-cs(20)] (8)2sine cose =sin (20) (9)Sin(a±B)=sina cosB±cosa sin B (10)cos(a±B)=-sina cosB cosa sin B ammasmB-oa-Bew-a+g 2eosacsB-eosa-B)Hcoga+Bn (13)sin cossin(a)+sin(+
常用三角公式 (1) exp(jθ )=cosθ +jsinθ (2) cosθ = 2 1 [ exp(jθ )+ exp(-jθ )] (3) sinθ = 2 j 1 [ exp(jθ )-exp(-jθ )] (4) sin2 θ +cos2 θ =1 (5) cos 2 θ -sin2 θ = cos(2θ ) (6) cos 2 θ = 2 1 [1+ cos(2θ )] (7) sin2 θ = 2 1 [1-cos(2θ )] (8) 2 sinθ cosθ =sin(2θ ) (9) Sin(α ± β )=sinα cos β ± cosα sin β (10)cos (α ± β )=sinα cos β ∓ cosα sin β (11)sinα sin β = 2 1 [cos(α − β )cos-(α + β )] (12)cosα cos β = 2 1 [cos(α − β )+cos(α + β )] (13)sinα cos β = 2 1 [sin(α − β )+sin(α + β )]