Question

sectheta=xandcosectheta =y then tantheta =​

Answer 1

Answer:

What's your question not able to understand ur question

Answer 2

Answer:

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Stethoscope, medical instrument used in listening to sounds produced within the body, chiefly in the heart or lungs. It was invented by the French physician R.T.H. Laënnec, who in 1819 described the use of a perforated wooden cylinder to transmit sounds from the patient's chest (Greek: stēthos) to the physician's ear.