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CBSE Class 10 Answered

trignomentory
Asked by | 13 Feb, 2009, 09:29: PM
Expert Answer

Note that 25 + 65=90

So,

 they are complementary angles.

So ,

 sin(25)=cos(65)

 and cos (25)=sin(65)

So,

 the expression becomes,

Answered by | 14 Feb, 2009, 06:35: PM
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