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" 7.Prove that "sin25^(@)cos115^(@)-(1/2...

" 7.Prove that "sin25^(@)cos115^(@)-(1/2)(sin40^(@)-1)

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Prove tha sin25^(0)cos115^(0)=(1)/(2)(sin40^(@)-1)

Prove tha sin 25^0 cos 115^0 = 1/2 (sin 140^0 -1)

Prove that: (cos40^(@)+cos50^(@))/(sin40^(@)+sin50^(@))=1

Prove that: (cos40^(@)+cos50^(@))/(sin40^(@)+sin50^(@))=1

Prove that (sin70^(@)-cos40^(@))/(cos50^(@)-sin20^(@)) = 1/(sqrt(3)) .

Prove that cos20^(@)cos40^(@)-sin5^(@)sin25^(@)=(sqrt(3)+1)/4

Prove that cos 20^(@) cos 40^(@) - sin5^(@) sin 25^(@) = (sqrt(3)+1)/(4) .

Prove that sin (cos^(-1) x) = cos (sin^(-1) x)

Prove that sin(45^@+A)sin(45^@-A)=1/2cos2A.

cos20^(@)cos40^(@)-sin5^(@)sin25^(@)=