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SVETLANKA909090 [29]
3 years ago
12

Evaluate 5(x³-2)+7 when x = -2​

Mathematics
1 answer:
tamaranim1 [39]3 years ago
4 0

Answer: 5x³ - 10 should be your correct answer

Step-by-step explanation:

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<h3>Answer: Choice H)  2</h3>

=============================================

Explanation:

Recall that the pythagorean trig identity is \sin^2 x + \cos^2x = 1

If we were to isolate sine, then,

\sin^2 x + \cos^2x = 1\\\\\sin^2 x = 1-\cos^2x\\\\\sin x = \sqrt{1-\cos^2x}\\\\

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Therefore,

\frac{\sqrt{1-\cos^2x}}{\sin x}+\frac{\sqrt{1-\sin^2x}}{\cos x}=2

is an identity as long as 0 < x < pi/2

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