Question

EDAL!!!!!!!!!!!! What is the missing justification in the proof of the Pythagorean identity below, sin^2(x)+cos^2(x)=1, using a right triangle? A. Transitive property of equality B. Substitution property of equality C. Reflexive property of equality D. Symmetric property equality

Answer 1

You have to jusitfy the step that leads from sin (x) = a/c and cos(x) = b/c to sin^2 (x) + cos^2(x) = [a^2 / c^2] + [b^2 / c^2].


As you can see go from the first statement to the second by substituting the value of sin(x) by a/x and the value of cos(x) by b/c.


Then, the answer is the option b. substitution property of equality.