Question

prove that=sin^2(a)+cos^2(a)=1

Answer 1

hay bro hear is ur answer :
let say a=x and b=y 
picture helps, 
draw a triangle on a plane, with angle theta, with hypotenuse c (let's say c=r) 
x (adjacent side) over r will be cos(theta) 
as well as y(opposite side of theta) over r will be sin(theta) 

therefore, x^2 + y^2 = r^2 
if you divide both sides by r^2 you have x^2/r^2 +y^2/r^2 = 1 
since x^2/r^2 = cos^theta, and y^2/r^2=sin^2theta then 
x^2/r^2 +y^2/r^2 = 1 will be cos^2theta +sin^theta = 1 

____swarnim ___###

Answer 2

Hope that the pic is clear.....