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" Evaluate: "sin^(2)72^(@)-sin^(2)60^(@)...

" Evaluate: "sin^(2)72^(@)-sin^(2)60^(@)

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

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^(@))

Without using trigonometric tables, evaluate. "sin"^(2)34^(@)+"sin"^(2)56^(@)+2" tan"18^(@)"tan"72^(@)-"cot"^(2)30^(@)

Prove that sin ^(2) 72 ^(@)- sin ^(2) 60 ^(@)= (sqrt5-1)/(8).

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

Evaluate sin^(2)45^(@)+cos^(2)60^(@)+cosec^(2)30^(@) .

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

Find the value of cos^(2)72^(@) - sin^(2) 54^(@) .

Evaluate : (i) sin^(2)30^(@)-2cos^(3)60^(@)+3tan^(4)45^(@) (ii) (cos0^(@)+sin45^(@)+sin30^(@))(sin90^(@)-cos45^(@)+cos60^(@))