A-level Maths Trigonometry help
show that 2Cos²x+Cosx-6=0 has no solutions.
I'm not sure how to do this. I've done the discriminant, but it is positive so would have 2 real roots
I'm not sure how to do this. I've done the discriminant, but it is positive so would have 2 real roots
oh, so i have to solve for Cosx, then it shouldn't be possible to get a value for x from that cause it will be larger than 1 or smaller than -1?
Original post by thatoneTDGfan
oh, so i have to solve for Cosx, then it shouldn't be possible to get a value for x from that cause it will be larger than 1 or smaller than -1?
okay thank-you!! 
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