Math, asked by jagseergndhi91, 5 months ago

prove that cos7x +cos5x %sin7x +sin5x =cot x

Answers

Answered by chintunihar07

0

Step-by-step explanation:

LHS=

sin7x−sin5x

cos7x+cos5x

=

2sin(

2

7x−5x

)cos(

2

7x+5x

)

2cos(

2

7x+5x

)cos(

2

7x−5x

)

=

sinxcos6x

cos6xcosx

=

sinx

cosx

=cotx=RHS

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