Need help solving this trigometric equation?

0 ⤊

Need help solving this trigometric equation?

Find exactly: 2 sin 45˚ + 3 sin 135˚

2007-01-11 06:43:00 · 3 answers · asked by thomasgraham880 1 in Science & Mathematics ➔ Mathematics

3 answers

sin 45° = sin 135° = √(2)/2
2*√(2)/2 + 3*(2)/2 = 5√(2)/2

2007-01-11 06:49:47 · answer #1 · answered by Edgar Greenberg 5 · 0⤊ 0⤋

2 sin (45) = 2^(1/2)
sin (135) = 2^(1/2)/2
==>

ans = ( 5 * 2^(1/2) ) /2
= 3.53553

2007-01-11 06:51:11 · answer #2 · answered by electro_nnn 2 · 0⤊ 0⤋

ok. so what is the problem?

Sin 45* is .70710678.......
Sin 135* is (by a strange coincidence) .70710678...

so its simply 5 (.70710678)

which is 3.54'

but I think your teacher is trying to show you something here. What do you think it is??

.

2007-01-11 06:52:25 · answer #3 · answered by ca_surveyor 7 · 0⤊ 0⤋