Write the expression as one involving only sinx and cosx.?

2 ⤊

Write the expression as one involving only sinx and cosx.?

sin2x+cos3x

2007-02-06 14:35:23 · 2 answers · asked by Anonymous in Education & Reference ➔ Homework Help

2 answers

Sin2x = 2sinxcosx
cos3x = 4(cosx)^3-3cosx

so sin2x+cos3x = 2sinxcosx+4(cosx)^3-3cosx

Here cosx is common to all terms.

So this can be re written as

sin2x+cos3x = cosx{2sinx+4(cosx)^2-3}

2007-02-06 14:43:17 · answer #1 · answered by Josh 3 · 2⤊ 0⤋

I have no idea. even if I did I would not tell you. Do your own homework.

2007-02-06 22:49:32 · answer #2 · answered by Anonymous · 0⤊ 1⤋