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# C3 question + 'arcsin' = i'm confused watch

1. what is 'arcsin' and 'arccos' ???

A question gives me, 'y= arccos x' and asks me to express 'arcsin x' in terms of 'y'.

can someone explain 'arcsin' and 'arccos' please and advise me on how to tackle this question
2. inverse of sin and inverse of cos
3. January 2007:

Given that: y = arccos x, -1 < x < 1 and 0 < y < pi,

(a) express arcsin x in terms of y. (2)

(b) Hence evaluate arccos x + arcsinx. Give your answer in terms of pi. (1)

_____________________

I'm baffed by this question too. Can anyone shed any light on this?

Some dude helped me by saying that 'for this question you basically need to know cosx = sin (pi/2 -y) therefore arcsin = (pi/2 -y)'... How are you supposed to know this?
4. Yes they are the inverse functions of cos and sin. I presume the question is pretty much asking for which transformation will get you from y=arccos to y= arcsin. Might be worth taking a look at the two graphs.
5. (Original post by W.H.T)
what is 'arcsin' and 'arccos' ???

A question gives me, 'y= arccos x' and asks me to express 'arcsin x' in terms of 'y'.

can someone explain 'arcsin' and 'arccos' please and advise me on how to tackle this question
arcsin and arccos are the inverse graphs of sin and cos. They are reflected in the line y = x

Start by sketching y = sin x and y = cos x then turn them into arcsin and arc cos.

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