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सिद्ध कीजिए: cos ^(2)30^(@)+sin^(2)30^(...

सिद्ध कीजिए: `cos ^(2)30^(@)+sin^(2)30^(@)=1.`

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cos^(2)30^@-sin^(2)30^@=cos60^@

Prove that cos 60^(@)=cos^(2)30^(@)-sin^(2)30^(@) .

(sin ^ (2) 30 ^ (@) - cos ^ (2) 30 ^ (@)) / (sin ^ (2) 30 ^ (@) + cos ^ (2) 30 ^ (@)) =

Prove that : cos^(2)30^(@)-sin^(2)30^(@)=cos60^(@)

Prove that : cos^(2)30^(@)-sin^(2)30^(@)=cos60^(@)

sin^(2)30+cos^(2)60

Solve for x : cos^(2)30^(@)+sin^(2)2x=1

cos 45^@=1/sqrt2 and sin 30^(@)=1/2 . Find the value of cos^(2)45^(@)+sin^(2)30^(@) .

The value of (1)/(2) sin ^(2) 90^(@) sin^(2) 30^(@) cos ^(2) 45^(@) + 4 tan ^(2) 30^(@) + (1)/(2) sin^(2) 90^(@) - 2 cos ^(2) 90^(@) is :

Evalutate : sin60^(@) cos 30^(@)+sin30^(@)cos 30^(@) .