kierralegner kierralegner

24-10-2017
Mathematics

contestada

Solve the question sin(x - 20) = cos(42) for x, where 0 , x , 90.
62
22
28
68

Respuesta :

chi3fcomm5nd chi3fcomm5nd

24-10-2017

you need to use the identity
cos(90-u)=sin(u)
if u=x-20
cos(90-x+20)=sin(x-20)
cos(110-x)=sin(x-20)
substituting in the original function
cos(110-x)=cos(42)
for the functions to be equal there input must be equal
110-x=42
x=68

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