Question

5tanA+4=0

Find: 2cos(180-A)

Answer 1

Step-by-step explanation:

given 5tanA+4=0

now tanA=-4/5

2cos(180-A)

=-2cosA------------------------(i)

if tanA=-4/5

cosA=-4/√41 {by taking method of triangle}

on putting in equation (i)

= -2×-4/√41

=8/√41