Question

sin(pi/2)co(pi/7)+cos(pi/2)sin(pi/7)

Can anybody help me please?

Answer 1

I'm guessing this is about goniometrics, so pi = ?

Answer 2

It's write the expression as either sine, cosine, and or tangent of a single angle...and the very last bloody one on my worksheet thank the gods -.-

Answer 3

Hehe, well, first off, pi = 180°, right? Fill that out first

Answer 4

sin(pi/2) = sin(180/2) = sin 90°

...

Answer 5

Right, do I need to get that wheel that my teacher keeps telling me to google out? Ummm I totally forgot the name...it's too early for this

Answer 6

sinAcosB+cosAsinB = sin(A+B)
=sin(pi/2 + pi/7)

Answer 7

One of these, yes http://upload.wikimedia.org/wikipedia/commons/4/4a/Goniometrische-cirkel-sin-cos.png

Answer 8

sum and difference identity

Answer 9

simplify parenthesis maybe

Answer 10

=sin(9pi/14)

Answer 11

I've never seen that exact wheel before Miel...I'm trying to find the one I book marked. Ah and ehuman...how did you get the 9? I know you multiplied to get 14 but the 9? Did you add?