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Little Maths Query

damienricefan · 2009-05-28 14:48:48

see 4 (b) (ii) http://www.studentxpress.ie/papers/trigsoln02.pdf how come whe the hald multplies by the one it stays as one ? I think it's cos the half multplies by the cos square x to form 2 cos square x but i'm not sure Just a little verfication if from people who can do trigonometry very well, no I think or im just…

28-05-2009 2:48pm

#1

damienricefan

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see 4 (b) (ii)

http://www.studentxpress.ie/papers/trigsoln02.pdf

how come whe the hald multplies by the one it stays as one ?

I think it's cos the half multplies by the cos square x to form 2 cos square x but i'm not sure

Just a little verfication if from people who can do trigonometry very well, no I think or im just guessings , not to be rude just that posts like that are never helpful ... thanks

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Comments

#2 28-05-2009 3:09pm

timmywex

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They multiplyed across by 2 to keep everything as whole number.

notice where it becomes 2cos^2x instead of cos^2x as it was previously

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#3 28-05-2009 3:10pm

alan4cult

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Am you should rewrite your post.
I didn't understand a word of it.

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#4 28-05-2009 6:06pm

Fringe

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1/2(1 - cosx) means that the whole thing is multiplied by 1/2. If you multiplied this by 2, they would cancel and you'd be left with 1(1 - cosx). 1 multiplied by anything is quite an obvious answer.

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