2 years ago

You want to find the width, AB, of a river. You walk along the edge of the river 100 ft and mark point C. Then

Mathematics

1 answer:

otez555 [7]2 years ago

4 0

Answer:

I have been trying to figure this one out, I'm sorry but i don't know the answer

Step-by-step explanation:

i hate math

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serg [7]

Answer:

Step-by-step explanation:

fairly certain it is b

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2 years ago

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Proove that 1/1-sin theta + 1/1+cos theta = 2×sec square theta

Rina8888 [55]

Step-by-step explanation:

We need to prove that,

$\dfrac{1}{1-\sin\theta}+\dfrac{1}{1+\sin\theta}=2\times \sec^2\theta$

Taking LHS,

$\dfrac{1}{1-\sin\theta}+\dfrac{1}{1+\sin\theta}\\\\=\dfrac{(1+\sin\theta)+(1-\sin\theta)}{(1-\sin\theta)(1+\sin\theta)}\\\\=\dfrac{2}{1-\sin^2\theta}\\\\\text{As}\ 1-\sin^2\theta=\cos^2\theta\\\\=\dfrac{2}{\cos^2\theta}\\\\\text{As}\ \dfrac{1}{\cos^2\theta}=\sec^2\theta\\\\=2\sec^2\theta\\\\=RHS$