Advertisements
Advertisements
प्रश्न
Evaluate the following: cos39° cos48° cos60° cosec42° cosec51°
Advertisements
उत्तर
cos39° cos48° cos60° cosec42° cosec51°
= `cos(90° - 51°) xx cos(90° - 42°) xx (1)/(2) xx (1)/(sin42°) xx (1)/(sin51°)`
= `sin51° xx sin42° xx (1)/(2) xx (1)/(sin42°) xx (1)/(sin51°)`
= `(1)/(2)`.
APPEARS IN
संबंधित प्रश्न
If 2 sin x° − 1 = 0 and x° is an acute angle; find:
- sin x°
- x°
- cos x° and tan x°.
From the given figure,
find:
(i) cos x°
(ii) x°
(iii) `(1)/(tan^2 xx°) – (1)/(sin^2xx°)`
(iv) Use tan xo, to find the value of y.
Find the magnitude of angle A, if 2 sin A cos A - cos A - 2 sin A + 1 = 0
If 4 cos2 x = 3 and x is an acute angle;
find the value of :
(i) x
(ii) cos2 x + cot2 x
(iii) cos 3x (iv) sin 2x
If 2 cos (A + B) = 2 sin (A - B) = 1;
find the values of A and B.
Solve for x : cos (2x - 30°) = 0
Solve for x : sin2 60° + cos2 (3x- 9°) = 1
In the given figure, if tan θ = `(5)/(13), tan α = (3)/(5)` and RS = 12m, find the value of 'h'.
Evaluate the following: `(2sin28°)/(cos62°) + (3cot49°)/(tan41°)`
Evaluate the following: `(5sec68°)/("cosec"22°) + (3sin52° sec38°)/(cot51° cot39°)`
