Question

Find cos θ if sin θ = -5/13 and tan θ > 0.

Answer 1

@hartnn

Answer 2

@sidsiddhartha

Answer 3

\(\cos^2 \theta = 1- \sin^2 \theta \)

Answer 4

i got -13/5

Answer 5

how ?

Answer 6

for the equation

Answer 7

\(\cos \theta = \sqrt{1-(-5/13)^2} \)

Answer 8

\(\cos \theta = \sqrt {144/169} = 12/13\)

Answer 9

and since tan theta is positive
both sin and cos would be negative
so final answer would be
cos theta = -12/13

Answer 10

ohh!!!