Question

Solve theeta
plese fast​

Answer 1

we have,

cos²¢+cos¢ = 0

cos¢(cos¢+1) = 0

cos¢ = 0 and cos¢+1 = 0

cos¢ = cos90 and cos¢ = -1 = cos180

so,, ¢ = 90,180 ....ans.

Answer 2

see the solution in photo