Math, asked by shannu7254, 9 months ago

cos⁻¹(cos 13π / 2) सिद्ध कीजिए

Answers

Answered by 123karthikchennai
0

Step-by-step explanation:

The given question is -: cos^-1(cos13π/2)

cos^-1 means 1/cos so 1/cos(cos13π/2)

so cos and cos get cancelled

so the Answer is 13π/2

Answered by amitnrw
0

Given   :  cos⁻¹(cos 13π / 6)

To find :    मान ज्ञात कीजिए

Solution:

cos⁻¹(cos 13π / 6)

= 13π / 6

संभव नहीं

∵ cos⁻¹  की मुख्य शाखा का परिषर  (0 , π  ) होता है

cos 13π / 6 = Cos(2π + π / 6)

हमें ज्ञात है की Cos(2π + α) = Cosα

=> Cos(2π + π/6)  = Cos(π/6)

=> cos 13π / 6  = Cos(π/6)

cos⁻¹(cos 13π / 6)

= cos⁻¹(cos  (π / 6))

= π / 6

cos⁻¹(cos 13π / 6) = π / 6

cos⁻¹(cos 13π / 2)

= 13π / 2

संभव नहीं

∵ cos⁻¹  की मुख्य शाखा का परिषर  (0 , π  ) होता है

cos 13π / 2 = Cos(6π + π / 2) = Cos(2*3π + π / 2)

हमें ज्ञात है की Cos(2nπ + α) = Cosα

=> Cos(2*3π + π/2)  = Cos(π/2)

=> cos 13π / 2  = Cos(π/2)

cos⁻¹(cos 13π / 2)

= cos⁻¹(cos  (π / 2))

= π / 2

cos⁻¹(cos 13π /2) = π / 2

और सीखें

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