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Course: Class 10 Math (India) - Hindi > Unit 8
Lesson 5: Trigonometric identitiesIntro to the Pythagorean trig identity 2 (Hindi)
Anmol introduces and proves the identity 1 + (tanθ)^2 = (secθ)^2 and 1 + (cotθ)^2 = (cosecθ)^2, which arises from the Pythagorean theorem again!