3 years ago

When you have a graph how do you know if it's a function?

Mathematics

2 answers:

butalik [34]3 years ago

3 0

Answer:

The vertical line test

Step-by-step explanation:

If the line as more than one y intercept, it's not a function

Snezhnost [94]3 years ago

3 0

Answer:B

Step-by-step explanation:

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daser333 [38]

Answer:

See below

Step-by-step explanation:

$\frac{1}{1-cos A} - \frac{1}{1+cos A} =2 cosec A cot A \\ \\ L. H. S.= \frac{1}{1-cos A} - \frac{1}{1+cos A} \\ \\ = \frac{1+cos A - (1 - cos A)}{(1-cos A)(1+cos A)}\\ \\ = \frac{1+cos A - 1 + cos A}{1-cos^{2} A}\\ \\ = \frac{2cos A }{sin^{2} A}\\ \\ =2 .\frac{1}{sin A}.\frac{cos A }{sin A}.\\ \\ = 2.cosec \: A.cot \: A \\ \\ = R.H.S$