Respuesta :

jullyan10602
We can simplify (1 - sin^2 (x)) tan(-x) as
-cos^2 (x). sin(x)/cos(x) = -cos(x) sin(x)
Since sin^2 (x) + cos^2 (x) = 1 and tan (-x) = -tan (x). (It may also be useful to know that cot (-x) = -cot(x) which will be incorporated in my solution later)

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