Question

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Answer 1

Answer:

To prove: sin^2@-cos^2Φ=sin^2Φ-cos^2@

Lhs:sin^2@-cos^2Φ

=1-cos^2@-(1-sin^2Φ) [since,sin^2@+cos^2@=1]

=1-cos^2@-1+sin^2Φ

=sin^2Φ-cos^2@

=rhs

Hence proved

Hpe it hlps u