Home » Forums » Trigonometry help

trigonometry homework help

Submitted by jack on 21. January 2005 - 16:25

Hi
I am bit confused with this
Can you look at this

Find x
sinx-tanx=0
sin4x-sin2x=0

thanks

verifying trig identities? ›
»

i need help!

Submitted by lindsey2010 on 11. May 2010 - 1:07.
find a if c=13 and b=12
»

cos2x +

Submitted by Saksham on 8. September 2009 - 2:52.

cos2x + cos2(x+π/3)+cos2(x-π/)=3/2

»

trignometry

Submitted by Saksham on 8. September 2009 - 2:51.
cosx sq. + cos sq.(x+π/3)+cos sq.(x-π/3)=3/2
»

trigonometry homework help

Submitted by Tutor on 21. January 2005 - 16:42.

Hi

here we go
Quote:sinx-tanx=0

sinx-tanx=0
sinx-sinx/cosx=0
sinx(1-1/cosx)=0
sinx =0 x=0 or
1-1/cosx=0
1/cosx=1
cosx=1

x=0'

Quote:sin4x-sin2x=0

sin4x -sin2x =0
2sin2xcos2x -sin2x =0
sin2x(2cos 2x -1) =0
sin2x =0
x=0' or
2cos2x -1 =0
cos2x=1/2
2x = 60'
x=30'

hope this helps

»