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# trig - p2 watch

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1. cotA - tanA = 2cot2A

RHS: 2 / tan2A

2 / 2tanA/1 - tan^2A

2(1-tan^2A) / 2tanA

1 - tan^2A / tan A

now what? x - y / z can't be split
2. (Original post by rae)
cotA - tanA = 2cot2A

RHS: 2 / tan2A

2 / 2tanA/1 - tan^2A

2(1-tan^2A) / 2tanA

1 - tan^2A / tan A

now what? x - y / z can't be split
(x-y)/z = x/z - y/z? How do you think you add and take away fractions?
3. 1 - tan^2A / tan A = 1/tanA - tan²A/tanA
=> cotA - tanA
4. thats what ive got in my notes, but i put numbers in (like one and two, nothing hard!) and was convinced it didnt work!

oh my god, this is ill fated...

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