Question

If cosA=2/5,find the value of i)sinAii)2tanA/1+cots^2A

Answer 1

Answer:

Step-by-step explanation:

given cos a=2/5

by basic formula cos a =( adjecent  side / hypotenuese )

so adjecent side =2

    hypotenuese =5

 by pythogoras theorem

[ a∧2+b∧2=c∧2 ]

 so,

   c=√21

 so,

1.)    sin a = ( opposite side / hypotenuese )

               = ( √21 / 5 )

2.)   please  enter question correctly

       is it { 2tan a / cot∧2A }  (or) { 2tan a/cos∧2A }