LIAO PI A A

LIAO PI A A niu pi xuan hao chi liao ma? 化简间sin（a-2pi)cos(a+pi）tan(a-99pi)cos(pi-a)sin(3pi-a)sin（-a-pi） cos(a-pi/2)/sin(5pi/2加a)×sin(a-2pi)×cos(2pi-a) 哪个 pi a nei 呜呜 csc(a+pi/2)=? sec(a-pi/2)=? sec(a+pi/2)=? sin(PI/2+a)=-4/5 a属于(Pi,3pi/2)则cos(Pi/3-a)为 化简(高一)[sin^2(pi+a)cos(pi+a)]/[tan(pi+a)cos^3(-pi-a)tan(2pi+a)] tana=2求sin(pi-a)cos(2pi-a)sin(-a+3pi/2)/tan(-a-pi)sin(-pi-a) f(a)=sin(pi-a)cos(2pi-a)tan(-a+3pi/2)/cos(-pi-a) 求 f(-31pi/3)的值 解方程：sin(2*a)/pi+(pi-a)/pi=0.8,最好能给出matlab程序. cos(Pi+a)=-0.5,3/2Pi cos(a-pi/3)=12/13,pi/3 化简：sin(2pi-a)sin(pi+a)cos(-pi-a)/sin(3pi-a)cos(pi-a)化简：sin(2pi-a)sin(pi+a)cos(-pi-a)---------------------------- sin(3pi-a)cos(pi-a)中间的一横是分数线 zai ci qing wen ? gao shou qingwo gang an zhuang wan xin xi tong ,dan zen me da bu liao zhong wen zi le a hai ji zhong yu yan dou mei you le ,wo zian zai zhi neng da pi yin le,----------- qiu gao shou bang mang cosa=2/3 a是第四象限角求sin(a-2Pi)+sin(-a-3Pi)cos(a-3Pi)/cos(Pi-a)-cos(-Pi-a)cos(a-4Pi)