pure 3 trig is killing me

Guys, I just find trig so hard
how would I solve these (preferably in depth because when it comes to trig, I just struggle sm) thanks
i've got no working to show

solve for values of x in the range
0<=x<=180

2sinx=3cos(x-60)

sinx=cos(x+120)

solve the following equations for values of x in the range 0<=x<=pi
sin(x+pi/4)=cosx

Reply 1

mqb2766

Original post by zolearns

For these you should expand the relevant trig terms using the addition identites so
sin(A+B) = ....
cos(A+B) = ...
and then simply solve for x as usual . You must know the identities, so have a go and post what youve tried.