trigonometric equations

[wise thunder]

Im not sure how much working out i need to show for this. Do I need to show graph or a cast diagram when finding solutions or can I just use the solveN button on my calculator to find the other solution.

[gleaming socket]

you can do that if you want and it helps you

ur not gonna lose marks if u dont tho

you should get the marks by using properties of the graph to find other solutions

like for example with sin when you get the first solution from ur calc you can use the fact that sin(180-x) to get the second solution then add 360 after

[wise thunder]

thats what im confusde about

idk what to add

like when do i add 180 or 360

[trail tendon]

For tan always add 180

For sin to find secondary solution do 180- calc value then add 360

[wise thunder]

i tried but i dont get the solution

[trail tendon]

U can subtract 180 too

[wise thunder]

ohhhhhh

that kinda makes sense, ill give it a go

why tf is the question posted wrong

sorry wrong question

but yes

idk why the image posted in the wrong one

[trail tendon]

I was confused lol

[wise thunder]

i just realised lol tf

this was the question

i minused 180 to the 16.7 solution, it wasnt giving me the right answer

[trail tendon]

To do these type of questions don't really use cast diagram icl tome consuming and more likely to make a mistake

[wise thunder]

what do you recommend to use?

graphs?

[gleaming socket]

no

just learn these

sin(x) = sin(180-x), then add or subtract 360

cos(x) = cos(360-x), then add or subtract 360