璁$畻锛歴in虏1掳+sin虏3掳+sin虏5掳+钬in虏87掳+sin虏89掳

sin cos tan In log to speak in the sin 化简sin^2 1度+sin^2 2度+sin^2 3度+.+sin^2 89度 s = 2*sin(x)-sin(2*x)+2/3*sin(3*x)-1/2*sin(4*x)+2/5*sin(5*x) sin(α+β)=2/3,sin(α-β)=3/5,sinα+sinβ=1/2,求cos(α+β)/2*sin(α-β) 已知sin(α+β)=2/3,sin(α-β)=3/5,sinα+sinβ=1/2,求cos[(α+β)/2]*sin[ 求∫In[1/sin^4(x)]dx~不定积分啊~ 计算：sin²1°+sin²2°+sin²3°...+sin²45°+sin&# 数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin& do you hear ming --- in the next room?1,sing 2,to sing 3,sin 已知sin平方30度+sin平方90度+sin平方150度=3/2,sin平方5度+sin平方65度+sin平方125度 已知sin(x+π/6)=1/3,求sin(5π/6-x)+sin^2(π/3-x)