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" 6.Prove that ":cos^(2)45^(@)-sin^(2)15...

" 6.Prove that ":cos^(2)45^(@)-sin^(2)15^(@)=(sqrt(3))/(4)

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Prove that: cos^(2)45^(@)-sin^(2)15^(0)=(sqrt(3))/(4)

Prove that cos^2 45^@-sin^2 15^@=sqrt3/4

The value of cos^(2)45^(@)-sin^(2)15^(@) is

Prove that: cos^2 45^0-sin^2 15^0=(sqrt(3))/4

Prove that cos 15 ^(@) - sin 15^(@) = (1)/(sqrt2)

The value of cos ^(2)45^(@) - sin^(2)15^(@) is

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

Prove that sin(45^@+A)sin(45^@-A)=1/2cos2A.

Prove that: sin(45^(@)-A)sin(45+A)=1/2cos2A