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सिद्ध कीजिए कि : sin^(2) 40^(@) + sin...

सिद्ध कीजिए कि :
`sin^(2) 40^(@) + sin^(2) 50^(@) = 1`

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2 sin 40^(@) sin 10^(@)=

Evaluate: sin^(2)40^(@)-cos^(2)50^(@)

sin 40^(@) - cos 50^(@)= _________

sin ^ (2) 17.50 + sin ^ (2) 72.50

4cos^(3)40^(@)-3sin50^(@)=

sin^(2)50^@+cos^(2)50^@=?

What is sin^2 50^@ + sin^2 40^@ equal to?

cos 40^(@)=0.76 then sin 50^(@) =………….

Prove that : sin 10^(@) + sin 20^(@) + sin 40^(@) + sin 50^(@) = sin 70^(@) + sin 80^(@).