Math, asked by arunsingh6, 1 year ago

find the value of cot 7* 1/2 =

Answers

Answered by knjroopa
2

Step-by-step explanation:

Given Find the value of cot 7* 1/2  

  • Now 7 ½ lies in the first quadrant.
  • So cot 7 ½ = cos 7 ½ / sin 7 ½  
  •                  = cos 15 / sin 15
  • So cos 15 degree = cos (45 – 30)
  •                             = cos 45 cos 30 + sin 45 sin 30 (using cos (a – b) )
  •                            = 1/√2 x √3 / 2 + 1 / √2 x ½
  •                             = √3 / 2√2 + 1/2√2
  •                              = √3 + 1 / 2√2
  • Now sin 15 degree = sin (45 – 30)
  •                               = sin 45 cos 30 – cos 45 sin 30
  •                               = 1/√2 x √3 / 2 – 1 / √2 x ½  
  •                               = √3 – 1 / 2 √2

Reference link will be

https://brainly.in/question/3260015

Answered by shahanaaz90
0

Answer:

we will get √3-1/2√2hope it helps you

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