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" 3."sin^(2)126^(@)-sin^(2)60^(@)...

" 3."sin^(2)126^(@)-sin^(2)60^(@)

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The value of sin^(2)60^(@)-sin^(2)30^(@) is:

Show that : cos^(2)60^(@)-sin^(2)60^(@)=-sin30^(@)

Show that : cos^(2)60^(@)-sin^(2)60^(@)=-sin30^(@)

Evaluate each of the following : 2cos^(2)60^(@)+3sin^(2)45^(@)-3sin^(2)30^(@)+2cos^(2)90^(@)

Prove that: sin^(2)A+sin^(2)(60^(@)+A)+sin^(2)(A-60^(@))=3/2

Prove that: sin^(2)A+sin^(2)(60^(@)+A)+sin^(2)(A-60^(@))=3/2

Find the value of the following: (i) "sin"^(2)30^(@)+"sin"^(2)45^(@)+"sin"^(2)60^(@)+"sin"^(2)90^(@) (ii) 2"sin"^(2)30^(@)-3cos^(2)45^(@)+cos^(2)60^(@)

Evaluate each of the following :- sin^(2)30^(@)+sin^(2)45^(@)+sin^(2)60^(@)+sin^(2)90^(@)

2-2sin^2 60^@=