Question

Trig question...cos ( 90 + Q)

is it equal to

+ sin Q since it's in quadrant 2 ?

Or is it -sin Q since cos is negative in quadrant 2 ?...:s

Answer 1

well, it is negative if Q is between 0 and 90

Answer 2

err, 0 and 180 .... doesnt really leave the left side does it till 270

Answer 3

but yeah, think of it like tuning the graph so that y is in place of the x axis

Answer 4

cos(t-90) = sin(t)

Answer 5

It's cos ( 90 + Q)
not 90 - Q tho :P

Answer 6

or t - 90 as you said