[/quote]
Thanks brother. You're the man.
It helped. I don't know that esnips has ebooks also. Now, I know.
Thanks brother.
:rose:


who can help us???
give 5 examples for blue,bluish white,yellow,orange&&red stars
give 5 examples of dwarf,white dwarf&&med. sized stars
hope you guys can help me.

^ what exactly in physics? it is a broad subject. if you love math, you'd surely love physics.
Last edited by aysbeaux (2008-09-08 23:25:07)
[quote=angpogimo]please...anyone!!help me!!
Find the angle of B(assume it as Beta):
sinB + cosB + sin(B+90�) + cos(B+180�) = 0
(show Solution please)
thanks!!![/quote]
using trigonometric identities, and Angle sum-difference where:
sin (A+B) = sinAcosB + cosAsinB
cos (A+B) = cosAcosB - sinAsinB
sinB + cosB + sin(B+90) + cos(B+180) = 0
sinB + cosB + [b](sinBcos90 + cosBsin90)[/b] + [b](cosBcos180 - sinBsin180)[/b] = 0
[i]sinB[/i] + [u]cosB[/u] + [i]sinBcos90[/i] + [u]cosBsin90[/u] + [u]cosBcos180[/u] -[i] sinBsin180 [/i]= 0
sinB(1 + cos90 - sin180) + cosB(1 + sin90 + cos180) = 0
sinB (1) + cosB(1) = 0
sinB = -cosB [i]divide both sides by cosB[/i]
(sinB)/(cosB) = -(cosB)/(cosB) [i] sin/cos = tan[/i]
tanB = -1
B = tan^1(-1) [i]inverse tangent of -1[/i]
[b]B = -45[/b]