𝗡𝗘𝗘𝗧𝗝𝗘𝗘 𝗖𝗼𝗻𝘁𝗲𝗻𝘁𝘀❤️🇮🇳

Trigonometric Ratio Trick - Pandits Badri Prasad, Har Har Bole, Sona Chandi Tole P/H = Sin, B/H = Cos, P/B = Tan Trigonometric Signs in Quadrants Trick - All Silver Tea Cups Quadrant 1 - All Positive Quadrant 2 - sin positive, therefore cosec Quadrant 3 - tan positive, therefore cot Quadrant 4 - cos positive, therefore sec

Important Points of NCERT : 🌟 Environmental protection act:- 1986 🌟 Air Act:- 1981(amended in 1987) 🌟 1990:- Delhi ranked 4th out of 41 most polluted cities in the World. 🌟 All buses run on CNG by- 2002 🌟 Water Act:- 1974 🌟 Chipko movement(Garhwal Himalayas):- 1974 🌟 JFM(Joint Forest Management):- the 1980s 🌟 Montreal Protocol (Canada):- 1987 (amended in 1989) 🌟 The Earth Summit:- 1992 (Rio de Janeiro) 🌟 World Summit:- 2002 (Johannesburg S.A) 🌟 IUCN Red List (2004):- 784 species extinct in last 500 years. 🌟 Joint Forest Management (JFM):- 1980's. 🌟 1st recombinant DNA:- 1972. 🌟 1st restriction endonuclease:- 1963. 🌟 1997:-An American company got patent rights on Basmati rice. 🌟 1990:- 4 year old girl got ADA deficiency

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