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

φ is in QIV

cos² φ + sin² φ = 1 sin < 0 in QIV

tan φ = sin φ / cos φ