bnolascoaranda2652
13.10.2019 •
Mathematics
Which of the following are equivalent to the function y = 4cos x - 2?
a. y= 4sin(x-pi/2)-2
b. y=4sin(x+pi/2) - 2
c. y=4cos(-x)-2
d. y=-4cos x +2.
there could be multiple answers too.
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Ответ:
option (b) and (c) holds.
Step-by-step explanation:
we are given a function y=4 cos(x)-2
we have to find a function equivalent to the given function.
As we know that cos(-x)=cos(x).
and also sin(π/2+x)=cos(x).
this means that 4 cos(-x)-2=4 cos(x)-2=y
and 4 sin(π/2+x)-2=4 cos(x)-2=y.
Hence the equivalent expression to the given equation is option (b) and (c).
Ответ: