If cos4x + acos2x +1=0 has atleast 1 solution then a belongs to what interval - Maths - Inverse Trigonometric Functions

Question

If cos4x + acos2x +1=0 has atleast 1 solution
then a belongs to what interval?

Ranjith Kumar Sonaboina · Accepted Answer

Dear student,
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regards,

If cos4x + acos2x +1=0 has atleast 1 solution then a belongs to what interval?