Question

Trig
let sin t=a , cos t=b , and tan t=c. write the expression in terms of a, b, and c.
5 cos (-t) - cos t

Answer 1

Hint : cos(-t) = cos (t)

Answer 2

why do you say that?

Answer 3

bec it's a rule
\[\huge\rm sin( - \theta) = - \sin \theta \]
^^^odd
\[\huge\rm cos (-\theta)= \cos \theta\]
^^even function

Answer 4

okay so…
5 cos (t) - cos t

?

Answer 5

replace cost t with b

Answer 6

5b-b
?

Answer 7

simplify that

Answer 8

4b ?