Question

Please Please explain this method​

Answer 1

Answer:

Step-by-step explanation:

sin theta =a/b

sin theta = perpendicular /hypotenuse

using pythagoras theorem

hypotenuse square =perpendicular square + base square

(b)^2 =a^2+ base square

(b)^2 - a^2 = base square

[tex]\sqrt{(a-b)(a+b)} =base square

cos theta = base /hypotenuse

cos theta =[tex]\sqrt{(a-b)(a+b)}/b

or

Given: sin = a/b

Answer 2

Answer:

in this answer he just simply put the value sin(theta) and underroot the value of cos(theta)