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# Complete Nomencalture (11th and 12th)

23/01/2023 0 0

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## Other Lessons for You

In A Triangle ABC, AB = AC And D Is Any Point On BC. Find BD If AB = 17cm, AD = 15cm And CD = 4cm.
Solution 1: Apply cos c = (17^2 + 4^2 - 15^2)/2*17*4 = 10/17 in ADC. In ABC, cos C = ( 17^2 + (4+x)^2 - 17^2) / 2*17*(4+x) Find x. Find the angle cos C, then take BD as x. Then cos C will be same for...

Derangements, Arrangement Of Things So That No Elements Appear In Their Original Place (Important for IITJEE)
"Like if I have 5 tshirts and i want to gift them to my 5 cousins named A,B,C,D,E, so find number of ways in which particular cousin won't get their particular tshirts." So number of ways: D(n)=n!*(1-1/1!+1/2!-1/3!+.....(-1)^n*1/n!)) Where...

Complex Number Algebra of complex numbers, addition, multiplication, conjugation. Polar representation, properties of modulus and principal argument. Triangle inequality, cube roots of...

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