sin(11兀/3)与sin(兀/3)相等吗?
比较大小(1)sin(-π/11)与sin(-π/17) (2)-sin(54π/7)与sin(-63π/8) (3)s
已知.sin (x+兀/6)=1/4.求:sin(5/6兀)+sin的平方(兀/3-x)
已知a(-0,兀且2SIN A-SIN ACOS A-3COS A=0求SIN(+兀/4)/SIN 2A+COS 2A+
已知3sinα cosα=0,求 3cosα 5sinα/sinα-cosα与sin²α 2sinα
sin(11*pi/3)=?
sin(n兀+4兀/3),cos(2n兀+兀/6),sin(2n兀+兀/3),cos((2n+1)兀-兀/6),sin(
三角化简sin(x-5兀)cos[(-兀/2)-x]cos(8兀-x)/sin[x-(3兀/2)]sin(-x-4兀)
若sin(π3
关于三角函数,sin(x/2)cos(x/2 兀/3) cos(x/2)sin(x/2 兀/3)=sin(x x 兀/3
sin a+sin 2a +sin 3a +...+sin na怎么求和?
已知a属于(0,π/2),且2sin^2 a-sin a cos a-3cos^2 a=0,求SIN(a+兀/4)/SI
计算:sin²1°+sin²2°+sin²3°...+sin²45°+sin