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Q13: Verify the identity.
Q14: Simplify. Q15: Simplify. Q16: Make the indicated trigonometric substitution in Q17: Simplify the trigonometric expression. Q19: Verify the identity. Q20: Write Q21: Use addition or subtraction formulas to Q22: Use addition or subtraction formulas to Q23: Prove Unlock this Answer For Free Now! View this answer and more for free by performing one of the following actions Scan the QR code to install the App and get 2 free unlocks Unlock quizzes for free by uploading documents