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# C3 trigonometry question Watch

1. For

Is there a method of doing part (a) using ?
2. is this A-level maths?
3. (Original post by IgorYakov)
For

Is there a method of doing part (a) using ?
None that I can think of, it's difficult to because this is inverse functions not the original functions. There's two methods that come to mind:

1) y=arccosx
cosy = x
so arcsinx = arcsin(cosy)

2) cosy=x
so x=sin(pi/2 - y)
so arcsinx = pi/2 - y
4. (Original post by studos)
is this A-level maths?

Yep it's from the Jan 07 paper, from the examiners report less than 10% could do this question

(Original post by Mike_123)
None that I can think of, it's difficult to because this is inverse functions not the original functions. There's two methods that come to mind:

1) y=arccosx
cosy = x
so arcsinx = arcsin(cosy)

2) cosy=x
so x=sin(pi/2 - y)
so arcsinx = pi/2 - y

Yeah 2) is how it is in the mark scheme. Was just wondering, thanks!

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