Question

prove in the easiest way possible..............

Answer 1

Answer:

yes you are Right good practice

Answer 2

Answer:

this is actually the easisest method to find that Sin^2theta + cos^2theta =1

Consider the triangle here ABC rt angled at A

sintheta = AC\BC

cos theta = AB \ BC

sin^2theta + cos^theta = Ac^2 + AB^2

                                       -------------------

                                                BC^2

    = BC^2\Bc^2     [ pythagoras theorem }

= 1