" If "sin(x+28^(@))=cos(3x-78^(@))" then "

If x is an acute angle and sin (x + 28^(@))=cos (3x - 78^(@)) , then x =

If x lt 90^(@) and sin(x + 28^(@)) = cos(3x - 78^(@)) , then find x

If cos 28^(@) + sin 28^(@) = k^(3), then cos 17^(@) is equal to

If cos 28^(@)+sin 28^(@)=k^(3) , then cos17^(@) equal to

Prove that: (i) sin 3x+"sin" 2x-"sin" x = 4 sin x cos((x)/(2))cos((3x)/(2)) (ii) ("sin" 3x+"sin" x)"sin" x+(cos 3x-cos x)cos x=0.

Evaluate the following: sin 78^@ cos 18^@-cos 78^@ sin 18^@

4 cos^(3)12^(@)-3sin78^(@)=

What is the value of (sin^(3) x + cos^(3) x)/( sin x + cos x) + sin x cos x ?