Question

if cosO +secO =2 then find the value of cosO​

Answer 1

Step-by-step explanation:

cos@+sec@=2

cos@+(1/cos@)=2

(cos^2@+1)/cos@=2

cos^2@+1=2cos@

cos^2@-2cos@+1=0

cos^2@-cos@-cos@+1=0

cos@(cos@-1)-1(cos@-1)=0

(cos@-1)(cos@-1)=0

cos@=1. or. cos@=1