Given that sin20=x, cos10=y, state each of the following in terms of x and y

a) cos30

b) cos 5

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- June 11th 2013, 08:14 AMTrefoil2727Trigonometric
Given that sin20=x, cos10=y, state each of the following in terms of x and y

a) cos30

b) cos 5 - June 11th 2013, 09:18 AMPlatoRe: Trigonometric
- June 12th 2013, 07:14 PMjpritch422Re: Trigonometric
This is part a:

There is the identity

let and

that makes and

where