" 1."sin(150^(@)+x)+sin(150^(@)-x)=cos x

Prove that : sin (150^@ + x) + sin (150^@-x) = cos x .

Prove the following: sin(150^@+x)+sin(150^@-x)=cosx

The value of cos 480^(@) sin 150^(@) + sin 600^(@) cos 390^(@) is

The value of cos(480^(@))sin(150^(@))+sin(600^(@))cos(390^(@)) is ………….

Write down the following complex number in polar form: Quotient of 12(cos150^(@)+i sin150^(@)) and 3(cos60^(@)+i sin60^(@))

Divide 12 (cos 150^@ + i sin 150^@) by 3 (cos 60^@ + i sin 60^@) .

Show that sin 150^(@) + cos 105^(@) =(1)/(sqrt(5))

Prove that sin (cos^(-1) x) = cos (sin^(-1) x)

" (2) "sin^(-1)x+sin^(-1)(1/x)+cos^(-1)x+cos^(-1)(1/x)" is equal to "

If x cot^(2)120^(@)+4sin^(2)150^(@)=3, then x=