If cos theta =-4/5 and theta lies in 2 quadrant, then find sin theta and tan theta its urgent - Maths - Trigonometric Functions

Question

If cos theta =-4/5 and theta lies in 2 quadrant, then find sin
theta and tan theta its urgent i have exams

Varun.Rawat · Accepted Answer

We have cos θ = -45
Since θ lies in second quadrant so, sin θ >0
now, sin θ = 1-cos2θ     ⇒sin θ = 1 - 1625 = 925 = 35now, tan θ = sin θcos θ = 3/5-4/5 = -34

If cos theta =-4/5 and theta lies in 2 quadrant, then find sin theta and tan theta. its urgent i have exams