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త్రికోణమితి తత్సమాలు భాగం -2

Translated from original video Title - Trig identities part 2 (part 4 if you watch the proofs) URL -https://www.khanacademy.org/math/trigonometry/less-basic-trigonometry/trig_iden_tutorial/v/trig-identities-part-2--parr-4-if-you-watch-the-proofs