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[" Prove that "],[" 1."sin(150^(@)+x)+si...

[" Prove that "],[" 1."sin(150^(@)+x)+sin(150^(@)-x)=cos x],[" 2."cos x+cos(120^(@)-x)+cos(120^(@)+x)=0]

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

Prove that (i) sin A+sin (120^(@)+A)+sin(240^(@)+A)=0 (ii) cos A+cos (120^(@)+A)+cos (120^(@)-A)=0

The period of cosx cos (120^(0) - x) cos (120^(0) + x) is

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

Prove that sin (n+1) x sin (n +2) x + cos (n +1) x cos (n +2) x = cos x

sin 120^(@) cos 150^(@)- cos 240^(@) sin 330^(@) =

sin 120^(@) cos 150^(@)- cos 240^(@) sin 330^(@) =

sin120^(@)cos150^(@)-cos240^(@)sin330^(@)

The minimum of cos^(2)(120^(@) + x)+ cos^(2) (120^(@) -x) is