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[High School Math] So our exam just finished and there's this 1 Trig Idendity no one seems to have gotten.
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morroblivion is in High School Math
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We're supposed to prove/show that (1 cosx sinx)/(1 sinx-cosx) = (1 cosx)/sinx

What our teacher told us is that we're not supposed to cross multiply when proving identities. Wolfram says it's true but they cross multiplied in the solution.

Extra notes: Our teacher said no properties of equality can be used because at the start , we're not sure if they're equal(identites). WE can however, multiply sides by 1. Example: The right side can be multiplied by (1-cosx)/(1-cosx) since it's equal to 1.

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11 years ago