=(sin3Acos2A-cos3ASin2A)/(cos3Acos2A+sin3Asin2A)
=(sin(3A-2A))/(cos(3A-2A)
=sinA/cosA
=tanA
Prove that: (sin3Acos2A-cos3ASin2A)/(cos3Acos2A+sin3Asin2A) = TanA
=(sin3Acos2A-cos3ASin2A)/(cos3Acos2A+sin3Asin2A)
=(sin(3A-2A))/(cos(3A-2A)
=sinA/cosA
=tanA
Prove that: (sin3Acos2A-cos3ASin2A)/(cos3Acos2A+sin3Asin2A) = TanA
S.E.E. Solution
5.0
stars based on
35
reviews
L.H.S =(sin3Acos2A-cos3ASin2A)/(cos3Acos2A+sin3Asin2A) =(sin(3A-2A))/(cos(3A-2A) =sinA/cosA =tanA
SUBSCRIBE TO OUR NEWSLETTER
You May Also Like
- Q. f(4x+5)=12x+18 , find the f'(x)
Soln:
Let 4x + 5 = a
or, x = (a-5)/4
Then,
f(a) = 12*(a - 5)/4 + 18
= 3*(a - 5) ...
Q. cosec40 - root(3)sec40 = 4cot100
Soln:
L.H.S.
= cosec40 - Ö3sec40
= 1/sin40 - Ö3/cos40
= 1/sin40 -
tan60/cos40 [tan60=Ö3]
= 1/sin40 -
si ... - Q. There are n GM's between 1/25 and 25. if the ratio of first mean to third mean is 1:25.find n.
Soln:
here,
no. of GM's (n) = ?
first term (a) =1/25
last term (b) =25
first mean/third mean = 1/25
we have,
common ratio ...
- Q. The inverse of the function f(x)=ax+b, x∈R is f-1(x)=8x-3.
Soln:
Here, f(x) = ax + b
Let y be the image of x under f, then
y = ax + b
x = (y-b)/a
Interchanging the role of x and y ...
- Q. The angle of elevation of an aeroplane from a point on the ground is 450. After 15 seconds of flight the angle of elevation changes to 300. If the aeroplane is flying horizontally at a height of 4000m in the same direction, find the speed of aeroplane.
Soln:
...