हिंदी
तमिलनाडु बोर्ड ऑफ सेकेंडरी एज्युकेशनएचएससी विज्ञान कक्षा ११

Prove that 32(3)sin π48 cos π48 cos π24 cos π12 cos π6 = 3 - Mathematics

Advertisements
Advertisements

प्रश्न

Prove that `32(sqrt(3)) sin  pi/48  cos  pi/48  cos  pi/24  cos  pi/12  cos  pi/6` = 3

योग

उत्तर

`32sqrt(3)[sin  pi/48 xx cos  pi/48] = 16sqrt(3)[2sin  pi/48  cos  pi/48]`

= `16sqrt(3) sin  pi/24((2pi)/48 = pi/24)`

Now `16sqrt(3)[sin  pi/24 xx cos  pi/24]`

= `8sqrt(3)[2 sin  pi/24  cos  pi/24]`

= `8sqrt(3)[sin  (2pi)/24]`

= `8sqrt(3) sin  pi/12`

Now `8sqrt(3)[sin  pi/12  cos  pi/12]`

= `4sqrt(3)[2 sin  pi/12 cos  pi/12]`

= `4sqrt(3)[sin  (2pi)/12]`

= `4sqrt(3)(sin  pi/6)`

Now `4sqrt(3) sin  pi/6 cos  pi/6 = 2sqrt(3)[2sin  pi/6 cos  pi/6]`

`2sqrt(3)[sin  (2pi)/6] = 2sqrt(3) sin  pi/3`

= `2sqrt(3) xx sqrt(3)/2`

= 3

= R.H.S

shaalaa.com
Trigonometric Functions and Their Properties
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 3: Trigonometry - Exercise 3.5 [पृष्ठ ११८]

APPEARS IN

सामाचीर कलवी Mathematics - Volume 1 and 2 [English] Class 11 TN Board
अध्याय 3 Trigonometry
Exercise 3.5 | Q 11 | पृष्ठ ११८

संबंधित प्रश्न

Find the values of sin (– 1110°)


`(5/7, (2sqrt(6))/7)` is a point on the terminal side of an angle θ in standard position. Determine the six trigonometric function values of angle θ


Find the value of the trigonometric functions for the following:
cos θ = `2/3`, θ lies in the I quadrant


Find the value of the trigonometric functions for the following:
sec θ = `13/5`, θ lies in the IV quadrant


Show that `sin^2  pi/18 + sin^2  pi/9 + sin^2  (7pi)/18 + sin^2  (4pi)/9` = 2


If sin x = `15/17` and cos y = `12/13, 0 < x < pi/2, 0 < y < pi/2` find the value of sin(x + y)


Find cos(x − y), given that cos x = `- 4/5` with `pi < x < (3pi)/2`  and sin y = `- 24/25` with `pi < y < (3pi)/2`


Find the value of tan `(7pi)/12`


Prove that sin(45° + θ) – sin(45° – θ) = `sqrt(2) sin θ`


If tan x = `"n"/("n" + 1)` and tan y = `1/(2"n" + 1)`, find tan(x + y)


Prove that sin 4α = `4 tan alpha (1 - tan^2alpha)/(1 + tan^2 alpha)^2`


Prove that (1 + tan 1°)(1 + tan 2°)(1 + tan 3°) ..... (1 + tan 44°) is a multiple of 4


Show that `cot(7 1^circ/2) = sqrt(2) + sqrt(3) + sqrt(4) + sqrt(6)`


Express the following as a sum or difference
sin 35° cos 28°


Express the following as a sum or difference
sin 5θ  sin 4θ


Show that `(sin 8x cos x - sin 6x cos 3x)/(cos 2x cos x - sin 3x sin 4x)` = tan 2x


Prove that `(sin 4x + sin 2x)/(cos 4x + cos 2x)` = tan 3x


If A + B + C = 180°, prove that sin2A + sin2B + sin2C = 2 + 2 cos A cos B cos C


If A + B + C = 180°, prove that sin A + sin B + sin C = `4 cos  "A"/2 cos  "B"/2 cos  "C"/2`


Choose the correct alternative:
If cos 28° + sin 28° = k3, then cos 17° is equal to


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×