Question

Quick question on the multiplication of trig functions.

Answer 1

I was getting the determinant of a matrix.This left me with \[((\cos(3t).3\cos(3t))-((\sin(3t).-3\sin(3t))\]

Answer 2

Just wondering how do I multiply this out

Answer 3

Wolfram doesn't break it down for me. Just gives me the result.

Answer 4

3cc--3ss = 3(c^2+s^2)

Answer 5

using the trig id that s^2+c^2 = 1 .... id say that leaves 3

Answer 6

@amistre64 Are you saying 1sin^2+1cos^2=1???

Answer 7

i hope so .... :)

Answer 8

Well the answer is 3 but the calculator says otherwise

Answer 9

I'm getting 0.98...........

Answer 10

Which I guess is close to 1, I guess.

Answer 11

its prolly due to input errors

Answer 12

the (3t) part is useless jargon in this case

Answer 13

sin.sin=sin^2

cos.cos=cos^2

sin^2+cos^2=1