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erik [133]
3 years ago
8

Simplify the expression sin^2x-1/cos(-x)

Mathematics
1 answer:
s344n2d4d5 [400]3 years ago
4 0
Use the Pythagorean identity sin ^{2} x+cos ^{2} x=1
to simplify the numerator.
sin ^{2} x-1=-cos ^{2} x
Now use that fact that
cos(-x)=cos(x) to set up the equivalent fraction:
\frac{sin ^{2}x-1 }{cos(-x)} = \frac{-cos ^{2}x }{cos(x)}
Now reduce between the numerator and denominator to get -cos(x)
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1. (3^3 + 3^2)^2 actually equals (27 + 9)^2

which is the first mistake

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which is the first mistake

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