Ask Me Help Desk - Calc (establishing Identities)

Ask Me Help Desk (https://www.askmehelpdesk.com/forum.php)

- High School (https://www.askmehelpdesk.com/forumdisplay.php?f=400)

- - Calc (establishing Identities) (https://www.askmehelpdesk.com/showthread.php?t=399231)

Calc (establishing Identities)

Prove the identity!

Cos (pi/2 - x) = sin X

Use your formulae: $cos(A-B) = cosAcosB + sinAsinB$

$cos(\frac{\pi}{2} -x) = cos(\frac{\pi}{2})cos(x) + sin(\frac{\pi}{2})sin(x)$

$cos (\frac{\pi}{2}) = 0$

$sin(\frac{\pi}{2}) = 1$

$cos(\frac{\pi}{2})cos(x) + sin(\frac{\pi}{2})sin(x) = (0)cos(x) + (1)sin(x)$

That's all, it's almost finished. You only have to simplify.

I hope it helped! :)

All times are GMT -7. The time now is 09:09 AM.