Simplifying trig (1 Viewer)

[spiltglows]

I've never learnt how to do this

simplify:

sin(pi - theta)
tan(2pi - x)
cos(pi + x)
cos(pi/2 - x)

Can anyone help me out?

 

[Menomaths]

I've never learnt how to do this

simplify:

sin(pi - theta)
tan(2pi - x)
cos(pi + x)
cos(pi/2 - x)

Can anyone help me out?

Ahh, Maths in Focus
Use sum and difference formula
http://www.sosmath.com/trig/Trig5/trig5/trig5.html

 

[Study notes]

2pi = 360
pi = 180

So Sin(pi - theta) = sin(180 - theta)

which equal to sin(theta)

tan(2pi - x) = tan (360 - x )

Which equal to -tan x

Etc.

 

[spiltglows]

Oh I see, thanks