证明:(1)2sin(兀+a)*cosa-1/1-2sin^2a=tan(9兀+a)-1/tan(兀+a)+1 证明:(2)tan(2兀-a)*sin(-2兀-a)*cos(6证明:(1)2sin(兀+a)*cosa-1/1-2sin^2a=tan(9兀+a)-1/tan(兀+a)+1证明:(2)tan(2兀-a)*sin(-2兀-a)*cos(6兀-a)/cos(a-兀)*sin(5兀+a)=t
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![证明:(1)2sin(兀+a)*cosa-1/1-2sin^2a=tan(9兀+a)-1/tan(兀+a)+1 证明:(2)tan(2兀-a)*sin(-2兀-a)*cos(6证明:(1)2sin(兀+a)*cosa-1/1-2sin^2a=tan(9兀+a)-1/tan(兀+a)+1证明:(2)tan(2兀-a)*sin(-2兀-a)*cos(6兀-a)/cos(a-兀)*sin(5兀+a)=t](/uploads/image/z/628982-62-2.jpg?t=%E8%AF%81%E6%98%8E%3A%EF%BC%881%EF%BC%892sin%28%E5%85%80%2Ba%29%2Acosa-1%2F1-2sin%5E2a%3Dtan%289%E5%85%80%2Ba%29-1%2Ftan%28%E5%85%80%2Ba%29%2B1+%E8%AF%81%E6%98%8E%3A%282%29tan%282%E5%85%80-a%29%2Asin%28-2%E5%85%80-a%29%2Acos%286%E8%AF%81%E6%98%8E%3A%EF%BC%881%EF%BC%892sin%28%E5%85%80%2Ba%29%2Acosa-1%2F1-2sin%5E2a%3Dtan%289%E5%85%80%2Ba%29-1%2Ftan%28%E5%85%80%2Ba%29%2B1%E8%AF%81%E6%98%8E%3A%282%29tan%282%E5%85%80-a%29%2Asin%28-2%E5%85%80-a%29%2Acos%286%E5%85%80-a%29%2Fcos%28a-%E5%85%80%29%2Asin%285%E5%85%80%2Ba%29%3Dt)
证明:(1)2sin(兀+a)*cosa-1/1-2sin^2a=tan(9兀+a)-1/tan(兀+a)+1 证明:(2)tan(2兀-a)*sin(-2兀-a)*cos(6证明:(1)2sin(兀+a)*cosa-1/1-2sin^2a=tan(9兀+a)-1/tan(兀+a)+1证明:(2)tan(2兀-a)*sin(-2兀-a)*cos(6兀-a)/cos(a-兀)*sin(5兀+a)=t
证明:(1)2sin(兀+a)*cosa-1/1-2sin^2a=tan(9兀+a)-1/tan(兀+a)+1 证明:(2)tan(2兀-a)*sin(-2兀-a)*cos(6
证明:(1)2sin(兀+a)*cosa-1/1-2sin^2a=tan(9兀+a)-1/tan(兀+a)+1
证明:(2)tan(2兀-a)*sin(-2兀-a)*cos(6兀-a)/cos(a-兀)*sin(5兀+a)=tana
证明:(1)2sin(兀+a)*cosa-1/1-2sin^2a=tan(9兀+a)-1/tan(兀+a)+1 证明:(2)tan(2兀-a)*sin(-2兀-a)*cos(6证明:(1)2sin(兀+a)*cosa-1/1-2sin^2a=tan(9兀+a)-1/tan(兀+a)+1证明:(2)tan(2兀-a)*sin(-2兀-a)*cos(6兀-a)/cos(a-兀)*sin(5兀+a)=t
sin(π+a)=sin(-a)=-sina tan(9π+a)=tan(π+a)=tan(-a)=-tana tan(2π-a)=tan(-a)=-tana
sin(-2π-a)=sin(-a)=-sina,cos(6π-a)=cos(-a)=cosa cos(a-π)=-cos(-a)=-cosa,sin(5π+a)=sin(-a)=-sina
1
2sin(π+a)*cosa-1=-(1+2sinacosa)=-(sina+cosa)^2
1-2(sina)^2=(cosa+sina)(cosa-sina)
左=-(sina+cosa)^2/[cosa+sina)(cosa-sina)=(sina+cosa)/(sina-cosa)=(tana+1)/(tana-1)
右=(-tana-1)/(1-tana)=(tana+1)/(tana-1)
2
左=-tana*(-sina)*cosa/[-cosa*(-sina)]=tana=右