Question

If cos thetha= -5/13 and sin thetha <0 , find tan thetha

Answer 1

Do you know what the equivalent of tanx is?

Answer 2

equivalent?
like sin/cos?

Answer 3

ya

Answer 4

well yea but idk how to find it ._.

Answer 5

To find theta, you divide sin(0)/cos(-5/13)

Answer 6

but sinthetha is less than zero not equal to it 0.0

Answer 7

cos thetha= -5/13

arccos(-5/13)=?

Answer 8

what? o.o

Answer 9

you will get more than 1 solution, sin thetha <0 tells you which one to use (the question implies that -180<=theta=<180

Answer 10

Or typed 'arccos'. Are you unfamiliar?