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

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 :- sin^(2)30^(@)+sin^(2)45^(@)+sin^(2)60^(@)+sin^(2)90^(@)

Provet that: sin^(2)72^(2)-sin^(2)60^(2)=(sqrt(5)-1)/(8)

If 2sin^(2)A=sin^(2)60^(@)+sin^(2)45^(@) , then find the value of sin A.

If 2sin^(2)A=sin^(2)60^(@)+sin^(2)45^(@) , then find the value of sin A.

(4(sin^(2)60^(@)+cos^(2)60^(@)))/(tan^(2)45^(@)-cos^(2)90^(@)+sin90^(@))

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^(@)