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Prove cos7x+cos5x/sin7x-sin5x=cotx

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Prove cos7x+cos5x/sin7x-sin5x=cotx
  • 1 answers

Gaurav Seth 4 years, 5 months ago

Left Hand Side = 

By applying the following identity of,



And, for the denominator's side, applying this identity,



Now,





Divide the following numbers  therefore,



Now, cancelling out the common factor of:  and dividing the numbers: ,

Therefore, by the following trigonometric identity: 

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