Can you please help in filing the return of a shopkeeper who sells mobiles, repairs them and helps in recharging the mobile numbers. And

He transfers money for other people also. 

1. Proof that sum of all angles of triangles are 180 degree .
   
2. State and proof intercept theorom

gst entry sale and purchase

To add one more brach to the existing one

inverse trignometric function formulas

Class7 simplify like terms 3a-2b-ab-(a-b+ab)+3ab+b-a

In triangle ABC angle b is 90 angle a is 45 and ac = 4cm find ab.

Why not we taken common angle

1. evaluate √-i

1. Why -cos y. Is equal to cos y in next step
   

The elevation of a tower of a station A due north of it is α and at a station B due west of A is β. Prove that the height of the tower is (AB sin⁡α  sin⁡β)/√(sin² ⁡α  -sin² ⁡β )

Place root 8.3 on number line - Chapter 1

Let set A = {x: x is a multiple of 3}, set B = {x: x is a multiple of 5}. Then A ∩ B is given by