Solving an equation?

  • Thread starter Jac8897
  • Start date
  • #1
25
0
solving an equation??

Homework Statement


how to get from here
sin@-.3cos@=.3
to
@=33.40 degrees


Homework Equations





The Attempt at a Solution


I try every thing teacher said to put it in the calculator and find the where it intersects x-axis but I get @=30 degrees
 

Answers and Replies

  • #2
5
0


this is pretty simple problem, I suggest you to study the sine and cosine functions well, and you will find that sin(pi) = 0 and cos(pi)=-1

Then sin(pi)-0.3*cos(pi)=0.3

0 + 0.3 = 0.3
 
  • #3
tiny-tim
Science Advisor
Homework Helper
25,836
251
Hi Jac8897! :smile:

(have a theta: θ and a phi: φ :wink:)

The trick is to write the LHS in the form sinθcosφ - cosθsinφ …

in this case, put .3 = sinφ/cosφ :wink:
 

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