Results are out! Find what you Get quick advice or join the chat
Hey! Sign in to get help with your study questionsNew here? Join for free to post

Heinemann Core 3 Book: Trig Q

Announcements Posted on
Let our uni choice search tool match you with your perfect university 19-11-2015
  1. Offline

    OK PEOPLE dumb nacero2000 here again...bestow me with ur knowledge

    given that 5sin x cos y + 4cos x sin y = 0 and cot x = 2 wot is the value of cot y??
  2. Offline

    put one term on one side of the equals sign and keep the other term on the other side.
    Then divide one side by the other and see what you've got.
  3. Offline

    It follows from cot(x) = 2 that cos(x) = 2sin(x). So

    5sin(x)cos(y) + 8sin(x)sin(y) = 0
    sin(x)(5cos(y) + 8sin(y)) = 0
    5cos(y) + 8sin(y) = 0 . . . . . because sin(x) is not zero
    5cos(y) = -8sin(y) . . . . . if sin(y) were zero then cos(y) would be too; so sin(y) is not zero
    cos(y)/sin(y) = -8/5
    cot(y) = -8/5
Updated: April 8, 2005
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

Today on TSR

Win an iPad Air 2

Don't miss our big TSR competition!

What class are you?
Study resources
Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.