If tan A -2-3-2- then 1-cos A -1-cos A -A- -5B- 5C- 9 - 4D- 4 - 9

The correct option is D 4/9 Given that tan A/2 = 3/2. 1 + cos A/1 cos A = 2 cos^2 A/2/2 sin^2 A/2 = cot^2A/2 = (2/3)^2 = 4/9 ...

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Trigonometric Ratios of Multiples of an Angle

If tan A /2=3...

Question

If tan $\frac{A}{2}$ = $\frac{3}{2}$ , then $\frac{1 + c o s A}{1 - c o s A}$ =

-5

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9/4

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4/9

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If cos(A-B) = 3/5 and tanA*tanB = 2 then

(a) cosA*cosB= 1/5 (c) cos(A+B)= -1/5

(b) sinA*sinB= 2/5 (d) sinA*sinB=4/5

If tan $\frac{A}{2}$ = $\frac{3}{2}$ , then $\frac{1 + c o s A}{1 - c o s A}$ =

t a n^{- 1} (\frac{1}{4}) + t a n^{- 1} = (\frac{2}{9}) = \frac{1}{2} c o s^{- 1} x,

In a right angled triangle, as shown below, if AB = 3 cm, BC = 4 cm then what is the value of cos A?

c o s A = \frac{3}{5}

9 c o t^{2} A - 1

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