Question

find the period of
y= -3cos x

Answer 1

same as the period of cosine

Answer 2

the \(-3\) out front has nothing to do with the period

Answer 3

thanku for helping me again @satellite73 :)

Answer 4

2pi

Answer 5

yw

Answer 6

how did u get the 2pi @henryarias5 ?

Answer 7

because the is the period of cosine

Answer 8

also the period of sine

Answer 9

tangent is a different story, it has period \(\pi\)

Answer 10

The -3 is indicative of the fact that the amplitude is 3 and it is reflected across the x axis.

Answer 11

and is there a formula to find the period?

Answer 12

anybody?

Answer 13

Yes!! it is \(\dfrac{2\pi}{\text{the number stands in the front of x}}\)
For example: sin x (the number in the front of x is 1) --> period = \(\dfrac{2\pi}{1}=2\pi\)
sin (2x) (the number in the front of x is 2) --> period = \(\dfrac{2\pi}{2}=\pi\)
cos (5x) (the number in the front of x is 5) --> period = \(\dfrac{2\pi}{5}\)

Answer 14

thnks @ooops