solve command gives extra solutions due to different syntax

2 次查看（过去 30 天）

Gil maor 2017-7-18

Hello All,

If an trigonometric equation 2250000*(6*cos(phi1) - sin(phi1))*(6*cos(phi2) - sin(phi2))

and I get extra results when using different syntax

1. when using syntax: solve((6*cos(phi1)-sin(phi1))*(6*cos(phi2)-sin(phi2))==0,'Real',true)

I get two answers, which co-respond to both angles, thinking of it I should get 4 answers, two for each angle

2. when telling matlab to produce results for both angle phi1 and phi2

solve((6*cos(phi1)-sin(phi1))*(6*cos(phi2)-sin(phi2))==0,[phi1 phi2],'Real',true)

I get 4 results for each angle,

two results are the correct results. the other two two are 0 and 0.

which are not the correct results for this equation.

what am I, doing wrong?

Thanks!

Gil,

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