Question

find the value of the expression if sin beta= 0.45, find cos(pi/2-beta)

Answer 1

do i just do pi/2-0.45?

Answer 2

sin beta is 0.45...but beta is not 0.45 does that make sense?

Answer 3

\[\Large \cos (\frac \pi 2 - \beta) \implies \cos \frac \pi 2 \cos \beta + \sin \frac \pi 2 \sin \beta\]
are you familiar with this?

Answer 4

no idk what you just did

Answer 5

it's a trig formula \[\LARGE \cos (A - B ) \implies \cos A \cos B + \sin A \sin B\]

Answer 6

in this case, our A is pi/2 and B is beta

make sense?

Answer 7

yeah but whats beta?