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# How do I know when to use radians or degrees? watch

1. The question will either state it or give a fraction using π, for example 0<X<π/2
LilN jsk800
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4. (Original post by TSlayerr)
LilN jsk800
Calculus is always done in radians.

d/dx(sin x) = cos x is true only if x is in radians
5. (Original post by TSlayerr)
LilN jsk800
Ooo nope don't think so, part 2 to that question isn't a trig question and part 1 is just proving rather than working anything out. Think the answer to part 2 is probs just a fraction of some sort
6. (Original post by TSlayerr)
LilN jsk800
It will be in radians because you are doing calculus
7. (Original post by LilN)
Ooo nope don't think so, part 2 to that question isn't a trig question and part 1 is just proving rather than working anything out. Think the answer to part 2 is probs just a fraction of some sort
Actually, yeah sorry, didn't read the question properly. Answer in radians and solve it by replacing the equation with integral of cos^2 theta. Sorry aha, it's been a long day
8. (Original post by LilN)
Actually, yeah sorry, didn't read the question properly. Answer in radians and solve it by replacing the equation with integral of cos^2 theta. Sorry aha, it's been a long day

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