The Student Room Group

pure maths trig question help??

Hi, can someone help me work out this question please?
Given that sin𝜃=2/7 and 𝜃 is obtuse, find the exact values of cos𝜃 and tan𝜃.
(edited 6 years ago)
27 yh,,,,,
Reply 2
woops lol just fixed it
Reply 3
Original post by UchihaMadara
27 yh,,,,,
woops lol just fixed it
Original post by rebecca.786
woops lol just fixed it


What have you done so far, maybe drawn a sketch of all three trigonometric functions in the obtuse domain to get a feel of the problem...
so you can start off with a right angled triangle. two of the sides will be 2 and 7 in length. you can find the other one easily.
then think about the fractions for cos and tan.... but then think how it will apply for the obtuse angles.

Quick Reply