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Pure 3 help...

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mac:
thanks candy.
How can i do 2nd part....its not complet, its suppose to b 2x +67.4....
 

louis:
Candy,
I follow your working on the second part.I would like to forward the solution to you.
( My working below are in degree ,plz put the degree on yourself.)

13 sin ( 2x + 67.38 ) =11
 sin ( 2x + 67.38) = 11/13 = 0.8462
        2x + 67.38  =  57.8  degree,    122.2 degree
        2x              = -9.58,      54.82
                         = ( 360-9.580)  ,    54.82
                         =350.42,   54.82
          x              = 175.2,   27.41
                         =  175.2,  27.4             

candy:
ohh im sorry mac i misread the question...i didnt see the 2{theta} i read it as {theta} only
but i hope u understood the method!
Goodluck! :)

mac:
its ok i understand....i don't always get the angle right with this method....
Can i just use the sin graph to find the angles rather than +/- 180 or 360. I get confused with +/- , and when to use 180 or 360. What if i have to find more angles in the range. Do i just keep on adding 360??

 

twilight:
for frist quarant all the sin,cos and tan are positive
for second quadrant , only sine is positive
for third quadrant , only tan is positive
for fourth quadrant , only cosine is positive

and u havta add 360 to the reference angle .. which is 57.8 in this case .. not to the final answer

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