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| 1. |
Prove cos7x+cos5x/sin7x-sin5x=cotx |
| Answer» Left Hand Side =\xa0By applying the following identity of,And, for the denominator\'s side, applying this identity,Now,Divide the following numbers\xa0\xa0therefore,Now, cancelling out the common factor of:\xa0\xa0and dividing the numbers:\xa0,Therefore, by the following trigonometric identity:\xa0 | |