·大纲理)已知数列满足,,则的前10项和等于( )
若sin=,则sin=________.
已知sinθ=,cosθ=,则tanθ=________.
化简sin2α+sin2β-sin2αsin2β+cos2αcos2β=______.
已知cos=,0<α<,则sin=________.
已知sinθ-cosθ=,则sin3θ-cos3θ=________.