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3 years ago

Question 14 (5 points)

Mathematics

1 answer:

sergij07 [2.7K]3 years ago

7 0

Answer:

14) C

15) D, because 90:20=4.5

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See Below.

Step-by-step explanation:

We want to verify the identity:

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$\displaystyle \frac{(1-\cos x)^2}{\sin ^2x}=\tan^2\left(\frac{x}{2}\right)$

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$\displaystyle \frac{4\sin^4 u}{4\sin^2 u\cos ^2u}=\tan^2 u$

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We can substitute u back for x / 2:

$\displaystyle \tan^2\left(\frac{x}{2}\right)= \tan^2\left(\frac{x}{2}\right)$

Hence proven.

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