Math, asked by chansbbygirl, 4 days ago

Prove that cos2 9x – cos2 11x = sin 20x . sin 2x

Answers

Answered by sheebakhan8103

1

Step-by-step explanation:

LHS=

sin17x−sin3x

cos9x−cos5x

=

2cos(

2

17x+3x

)sin(

2

17x−3x

)

−2sin(

2

9x+5x

)sin(

2

9x−5x

)

=−

cos10xsin7x

sin7xsin2x

=−

cos10x

sin2x

=RHS

Hence proved

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