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C2 trig help please

help.png

Could someone help me work this out?
i don't know what to do after sin/cos =2 sin
Reply 1
Original post by 0utdoorz
help.png

Could someone help me work this out?
i don't know what to do after sin/cos =2 sin

If you had xy=2x \dfrac{x}{y} = 2x
what would you do to find y?

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(edited 11 years ago)
Reply 2
Original post by 0utdoorz
help.png

Could someone help me work this out?
i don't know what to do after sin/cos =2 sin


Multiply by cos theta , equate to zero and factorise.

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