If cos (ϕ)= 0.7087 and 3π/2≤ ϕ ≤2π, approximate the following to four decimal places. (a) sin(ϕ)= ( ) (Round to four decimal places.) (b) tan(ϕ)=( ) (Round to four decimal places.)

Question

If cos (ϕ)= 0.7087 and 3π/2≤ ϕ ≤2π, approximate the following to four decimal places.

(a) sin(ϕ)= ( ) (Round to four decimal places.)

(b) tan(ϕ)=( ) (Round to four decimal places.) 

 

 

 

Answer 1

sin² Φ = 1 - cos² Φ QIV, sin < 0

tan Φ = sin Φ / cos Φ