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boyakko [2]
3 years ago
13

Which is the definition of a ray?

Mathematics
2 answers:
valkas [14]3 years ago
7 0

Answer:

Ray. Definition: A portion of a line which starts at a point and goes off in a particular direction to infinity. Try this Adjust the ray below by dragging an orange dot and see how the ray AB behaves. Point A is the ray's endpoint. -Google

Step-by-step explanation:

cluponka [151]3 years ago
7 0

Answer:

A line which starts at a point with given coordinates, and goes off in a particular direction to infinity.

Simpler Definition- A line that starts at a point and goes off in one direction that never stops

Step-by-step explanation:

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Double angle (or half angle, depending how you look at it) identities:

\cos^2\dfrac x2=\dfrac{1+\cos x}2

\sin^2\dfrac x2=\dfrac{1-\cos x}2

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So we have

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Note that when taking the square root, we should take into account that that could yield two possible solutions, but we know \cos15^\circ>0 and \sin15^\circ>0, so it's also the case that \cot15^\circ>0.

Also, the reason we have equality in the last step can be explained like so:

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