1 If 3cotA= 4 ,check whether 1- tan2A = cos2A sin2A or not 1+ tan2A 2 - Maths - Some Applications of Trigonometry

Question

1 If 3cotA= 4 ,check whether 1-
tan2A = cos 2 A
– sin 2 A or not
1+ tan2A
2 If tanA= a/b, find the
value of cosA + sinA
cosA – sinA
3 If 3 tanA = 4, find the
value of 4cosA – sinA
2cosA + sinA
4 If 3cotA = 2, find the
value of 4sinA – 3cosA
2sinA + 6cosA
5 If tanA = a/b, prove that
asinA – bcosA = a2 –
b2
asinA + bcosA a2 +
b2
6 If secA = 13/5, show that
2sinA – 3cosA = 3
4sinA – 9cosA
7 If cosA = 12/13, show that
sinA(1 - tanA)= 35/156
i dont get hw do we solve such sums plz help
me out

Ankush Jain · Accepted Answer

1) It is given that 3cot A = 4 Or, cot A =

Consider a right triangle ABC, right-angled at point B

If AB is 4k, then BC will be 3k, where k is a positive integer In Î”ABC, (AC)2 = (AB)2 + (BC)2 = (4k)2 + (3k)2 = 16k2 + 9k2 = 25k2 AC = 5k

cos2 A âˆ’ sin2 A =

âˆ´

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