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in my txbook the answer is tan^2x

There's a negative in front that cannot be ignored

Are you sure you wrote down the problem correctly?

k wait

k it was sec not -sec sorry i just wrote it :- instead of writing it :

can u plz help me with other one?

cotx-cos^3xcscx

thank you so much u rock!i wish u were my pre cal teacher

okay

wait how did u get cos^3x-cosx=cosx(1-cos^2x) ?

can't we just subtract it out?

k i get what u did !thanks for all ur help