Recent content by darrenc

happy now?

Homework Statement Find the point of intersection Homework Equations Equation 1 y=1/5(2)4x-7 Equation 2 y=1/10(1/2)9-3x The Attempt at a Solution Made them equal each other got rid of the 1/5 one one side and it made the 1/10 turn into 1/2 and now i don't know...

I know double angle identities such as sin2x = 2sinxcosx and the three cos2x ones but i can't get anything to work I've got all the formulas but i don't know how to use them to make it work

How do I prove that (1+sin2x) = (cosx) (cosx + sinx) (cosx - sinx)