Question

prove !!!!!!!!!!!!!!!​

Answer 1

Answer:

LHS=cos2x=cos

2

x−sin

2

x

=

1

cos

2

x−sin

2

x

=

cos

2

x+sin

2

x

cos

2

x−sin

2

x

=

cos

2

x

cos

2

x+sin

2

x

cos

2

x

cos

2

x−sin

2

x

=

1+tan

2

x

1−tan

2

x

= RHS

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