Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -

Login

Username

Password

Not registered yet?

#1 2013-09-09 14:37:40

shivusuja
Full Member

Offline

Trignometry

please help me out

IF  a sin x +b cos x = c . Prove that     a cos b sinx=sq root(a sqared+b squared+c squared)

#2 2013-09-09 17:05:36

bob bundy
Moderator

Offline

Re: Trignometry

hi shivusuja



where





Do a similar thing with the second expression leading to cos(x + alpha)

Now you can use sin^2 + cos^2 = 1 to finish the proof.

Note: But I ended up with minus c^2 not plus.

Bob


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

#3 2013-09-10 00:27:26

shivusuja
Full Member

Offline

Re: Trignometry

thank you . may be the text book print is wrong.

Board footer

Powered by FluxBB