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3 years ago

Please help :( I don’t know this one:/

Mathematics

2 answers:

ipn [44]3 years ago

4 0

Answer:

i think is D

Step-by-step explanation:

because 2×7=21

3×21=63

and the parent still going

melisa1 [442]3 years ago

3 0

Answer:

its d

Step-by-step explanation:

its d cuz if you multiply 2 × 7 it will equal to 21

and then when you multily them both youll

get 63 3×21=63

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<h3>Answer: Choice H) 2</h3>

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Explanation:

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If we were to isolate sine, then,

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

We don't have to worry about the plus minus because sine is positive when 0 < x < pi/2.

Through similar calculations, $\cos x = \sqrt{1-\sin^2x}\\\\$

Cosine is also positive in this quadrant.

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So,

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

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

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