Integer (Z)= ...-3,-2,-1,0,1,2 3,4... A.If you add two integers you will get ineger Like 4 + 5 = 9 Integer+integer=integer So , you can say integers are closed under addition....
When the sum of two angles=90 degrees, they are called complementary angles. We can use following formula →sin(90-θ)=cosθ,cos(90-θ)=sinθ,tan(90-θ)=cotθ,cosec(90-θ)=secθ,sec(90-θ)=cosecθ We...