1.

`sin^(2)25^(@)+sin^(2)65^(@)+"co s ec"^(2)57^(@)-tan^(2)33^(@)`का मान ज्ञात करे ।A. 1B. 2C. 3D. 0

Answer» Correct Answer - b
`sin^(2)25^(@)+sin^(2)65 ^(@)+co s ec^(2)57^(@)=tan^(3)33^(@)`
`rArr(sin^(2)25^(@)+cos^(2)25^ (@))(sec^(2)33^(@)-tan^(2) 33^ (@))`
=1+1=2
Note:-
`sin^(2)65^(@)=sin^(2)(90^(@)-25^(@))=cos^(2)25^(@)`
`co s ec^(2)57^(@)=co s ec^(2)(90^(@)-33^(@))=sec^(2)33^(@)`


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