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Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

This is very simple, in the image attached, you can see for the angle theta in the right angled triangle, AC is the p [perpendicular], BC is the b [base] and AB is h [hypotenuse]. Cos^2theta + sin^2 theta can be written as :- ..........[because cos theta = b/h and sin theta = p/h] So, since b^2 + p^2 = h^2 [pythagoras theorem], we can write as h^2/h^2 = 1. Hence proved