Math, asked by fidaunni, 2 months ago

prove that cos7x+cos5x/sin7x-sin5x = cotx

Answers

Answered by thakursamar432

0

Step-by-step explanation:

Answer

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

Answered by rajv08844

0

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