The total of 324 of 20 paise and 25 paise make a sum of Rs. 71. The no of 20 paise coins is :
Let the number of 20 paise coins be x. Then the no of 25 paise coins = (324 - x).
0.20 * (x) + 0.25 (324 - x) = 71 => x = 200..
If (cos2 θ -1)(1+tan2 θ)+2 tan2 θ =1, 0°<θ<90° then θ is:
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