Question: I need help with number 20 only at the bottom. Please show all steps and do not use calculator. #21 my teacher said is correct

I need help with number 20 only at the bottom. Please show all steps and do not use calculator. #21 my teacher said is correct but he said the triangle graph is wrong??? Can someone please help me redo it or tell me what is wrong with it?

\f2 18. sin (c) - 4 In Exercises 19 - 42, solve the equation, giving the exact solutions which lie in [0, 27) 19. sin (x) - cos (2) 20. sin (2x) = sin (z)

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