Help! Solve 2cosx-sinx=0 for 0<=x<=360 (1 Viewer)

[carpe_diem]

Please show your working out!.

Thank you

* <= in the equation is less than or equal to

 

[BrickHead]

bring sinx to other side , divide by cos , turn it into tan, tan x = 2 , x = 63 and 243
i think O_O

2cosx = sinx

2 = tanx

x = 63 degrees and 243 degrees

 

[nightweaver066]

Divide both sides by cosx





d and m stands for degrees and minutes.

 

[rolpsy]

 

[carpe_diem]

Thank you so much! I understand it now

 

[someth1ng]

2 = tanx

I thought this method was banned?

Don't you have to equate and solve?

 

[zxreth]

I thought this method was banned?

Don't you have to equate and solve?

why would it be banned?

 

[UnrealAnchovies]

turn to Rcos(X + a) = 0

R = (4 + 1)^1/2 = root 5

a = arctan0.5 = 26 degrees 34 minutes...

pretty straightforward from there. answer comes out the same.

 

[RivalryofTroll]

2cosx-sinx=0 for 0<=x<=360
2cosx = sin x
2 = sinx/cosx (sinx/cosx = tanx)
tan x = 2
Plug into calculator for answer!

 

[someth1ng]

why would it be banned?

I'm not sure but it was something to do with A and B being negative.