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Ex 8.3, 1 - Evaluate (i) sin 18 / cos 72 (ii) tan 26/cot 64 - Trignometric ratios of complementry angles

  1. Chapter 8 Class 10 Introduction to Trignometry
  2. Serial order wise
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Ex 8.3, 1 Evaluate : (i) sin⁡〖18°〗/cos⁡〖72°〗 sin⁡〖18°〗/cos⁡〖72°〗 = sin⁡〖18°〗/cos⁡〖 (90° − 18°) 〗 = sin⁡〖18°〗/(sin⁡18°) = 1 Ex 8.3, 1 Evaluate : (ii) tan⁡〖26°〗/cot⁡〖64°〗 tan⁡〖26°〗/cot⁡〖64°〗 = tan⁡〖 (90°− 64°) 〗/cot⁡〖 64° 〗 = cot⁡〖64°〗/(cot⁡64°) = 1 Ex 8.3, 1 Evaluate : (iii) "cos 48° − sin 42°" "cos 48° − sin 42°" = "cos (90 − 42°) − sin 42°" = "sin 42° − sin 42°" = 0 Ex 8.3, 1 Evaluate : (iv) cosec 31° – sec 59° cosec 31° – sec 59° = "cosec (90 − 59°) − sec 59°" = "sec 59° − sec 59°" = 0

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