Question

23. sin 2theta- cos 2theta = 1
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Answer 1

Answer:

Using SOH CAH TOA, sin(a)=y/1, and cos(a)=x/1. ... Using pythagorean theorem and the triangle we've established, cos^2(a)+sin^2(a)=1, because as mentioned earlier sin and cos(a) were always equal to the length of the sides adjacent to the right angle of the triangle, with 1 being the hypotenuse