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sin^(2)30+sin^(2)45^(@)+sin^(2)60^(@)...

sin^(2)30+sin^(2)45^(@)+sin^(2)60^(@)

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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.

Prove that "sin"^(2)30^(@),"sin"^(2)45^(@),"sin"^(@)60^(@) are in A.P.

(2)/(3)(cos^(4)30^(@)-sin^(4)45^(@))-3(sin^(2)60^(@)-sec^(2)45^(@))+(1)/(4)cot^(2)30^(@)

(kcosec^(2)30^(@).sec^(2)45)/(8cos^(2)45^(@).sin^(2)60^(@))=tan^(2)60^(@)-tan^(2)30^(@) , then k = ?

Evaluate the following: (i) cos600cos45o-sin60sin45o( ii) sin^(2)30o+sin^(2)45o+sin^(2)60o+sin^(2)90o

Evaluate : (sin^(2)30^(@)+sin^(2)45^(@)-4cot^(2)60^(@))/(2sin30^(@)cos30^(@)+(1)/(2)tan60^(@))

Evaluate : (sin^(2)30^(@)+sin^(2)45^(@)-4cot^(2)60^(@))/(2sin30^(@)cos30^(@)+(1)/(2)tan60^(@))

Calculate : sec^(2)45^(@)-cot^(2)45^(@)-sin^(2)30^(@)-sin^(2)60^(@) .