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" 9.Prove that: "cos105^(@)+cos15^(@)=si...

" 9.Prove that: "cos105^(@)+cos15^(@)=sin75^(@)-sin15^(@)

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Prove that: cos 105^@+cos15^@=sin 75^@-sin 15^@

Prove that : cos 105^@ + cos 15^@= sin 75^@- sin 15^@ .

sin15^(@)+cos105^(@)=?

Prove that (sin75^(@)+sin15^(@))/(sin75^(@)-sin15^(@))=sqrt3

Prove that : (i) "sin"105^(@)+cos105^(@)=(1)/(sqrt(2)) (ii) cos105^(@)+cos15^(@)="sin"75^(@)-"sin"15^(@)

Prove that: cos15^@-sin15^@=1/sqrt2

Prove that sin 105^(@) + cos 105^(@) = cos 45^(@)

Evaluate: sin 15^(@)cos 15^(@)-cos 75^(@)sin75^(@)

Prove that sin105^@+cos105^@=cos45^@

Prove that: sin 105^@+cos 105^@=cos 45^@