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" किद्ध कीजिर कि "sin^(2)12^(4)-sin^(2)6...

" किद्ध कीजिर कि "sin^(2)12^(4)-sin^(2)60^(@)=(sqrt(3)-1)/(8)

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sin ^(2) 24 ^(@) - sin ^(2) 6^(@) = (sqrt5 -1)/(8).

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

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

cos ^(2) 48^(@) - sin ^(2) 12 ^(@) = (sqrt5+1)/(8).

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

cos45^(@)cos60^(@)-sin45^(@)sin60^(@)=(sqrt(3)-1)/(2sqrt(2))

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

I : sin^(2) 42^(@) - sin^(2) 12^(@)=(sqrt(5)+1)/(8) II : 8 cos^(3) 10^(@) - 6 cos10^(@)= sqrt(3)

cos45^(@)cos60^(@)-sin45^(@)sin60^(@)=(sqrt(3-1))/(2sqrt(2))

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