what is the best option to verify sec(y)cos(y)=1
a. cot u =sin (u)/cos(u)
2 Answers By Expert Tutors
Experienced Physics Teacher for Physics Tutoring
Just recall the definition of secant:
sec(y) = 1 / cos(y)
So sec(y)cos(y) = [1 / cos(y)] * cos(y) = 1
The best answer is (d).
Mathematics Teacher - NCLB Highly Qualified
d. It is one of the identities/definitions.
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