" If: "sin(alpha/2)+cos(alpha/2)=1.4," then "sin alpha=...

If sin.alpha/2+cos.alpha/2=1.4, then: sinalpha=

If alpha in Q_(4) and sin((alpha)/(2))+cos((alpha)/(2))=-(1)/(2) then sin2 alpha=

If alpha in Q_(4) and (sin alpha)/(2)+(cos alpha)/(2)=-(1)/(2) then sin2 alpha=

I : If (cos alpha )/(a)=(sin alpha )/(b) then a cos 2 alpha + b cos 2 alpha =a II : If (sin alpha )/(a) =(cos alpha )/(b) then a sin 2 alpha + b cos 2 alpha = a

If alpha in Q_(4) and "sin" (alpha)/(2) + "cos" (alpha)/(2) = (-1)/(2) "then sin 2" alpha =

The simplified value of sin^(4)alpha+cos^(4)alpha+(1)/(2) sin^(2) 2 alpha is

Prove that, 1/3 ( cos^(3) alpha sin 3 alpha + sin^(3) alpha cos 3 alpha) = 1/4 sin 4 alpha

sin alpha+sin2 alpha+sin4 alpha+sin5 alpha=4cos((alpha)/(2))cos(3(alpha)/(2))sin3 alpha