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| 1. |
Plss ch3 kae sare important formulae bhej do bhai / bahean... |
| Answer» All the formulas in the summary r important. Well mostly v useTan(x+y)Tan(x-y)Cot(x-y),(x+y)Cos(x+y), (x-y) same with sinAnd the last 5 formulas r important for the ladt exerciseU take a look of cosx+ cosy types also | |