Question

Iska answer mera -1 aa rha h bt 1answer h Iska kaise ​

Answer 1

Like tema will get cancelled

Answer 2

Answer:

Step-by-step explanation:

Cosπ or cos(180)=cos(180-0)=Cos0=-1(in 2nd quadrant cos will be negative)

Cos(2π)=Cos(360-0)=1(in 4th quadrant cos will be positive)

Here,all r even multiples then u won't get a negative sign here