Thread: Trig solution

1. The problem statement, all variables and given/known data
Given: sec = where 0< <90

and sin(A- )=sinA-3cosA



Determine the solution of
6cosA +3 = 2sinA


for A [-180; 180], rounded off to one decimal digit.

2. Relevant equations



3. The attempt at a solution

3=2sinA - 6cosA

3=2(sinA-3cosA)

=sinA-3cosA

= sin(A- )

Now I can't get rid of the theta

Good evening

If , then





Hence


From your equation: =sin(A-)

Convert to:

It should be possible to finish from here.
Hope this helps

Ciao