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Verified answer
Tanx+cotx=5tan=sin/cos ; cot=cos/sin demektir. Buna göre tan*cot=1 yapar.
İlk eşitliğin karesini alalım:
(tanx+cotx)²=5²
tan²x+2*tanx*cotx+cot²x=25
tan²x+2+cot²x=25
tan²x+cot²x=23