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C3 trig - where have I gone wrong?

I'm doing a question where I have to solve x for 0 degrees < x < 360 degrees and have gone wrong

ImageUploadedByStudent Room1443734441.880343.jpg

Can someone help?


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Original post by Excuse Me!
I'm doing a question where I have to solve x for 0 degrees < x < 360 degrees and have gone wrong

ImageUploadedByStudent Room1443734441.880343.jpg

Can someone help?


Posted from TSR Mobile


That second to bottom line is wrong. You haven't multiplied the half by cos^2(x) o the RHS
(edited 8 years ago)
Reply 2
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vannson
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What have you done in the second to last line?
Reply 3
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Excuse Me!
OP
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Original post by vannson
What have you done in the second to last line?


I have multiplied every thing by cos^2x (although forgot to times 1/2 by cos^2x)

Also I changed sin^2x to (1-Cos^2x) using the trig identity


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Reply 4
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Excuse Me!
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Original post by Sonnyjimisgod
That second to bottom line is wrong. You haven't multiplied the half by cos^2(x) o the RHS


Once I've done that does what I've got makes sense?

Also - is it just 1/2 x cos^2x = 1/2cos^2x


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