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মেকানিক্যাল ইঞ্জিনিয়ারিং

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12271. MCQPractice set · Question 23

গুণিতক কোণ (Multiple angle) cos 2A কে tan A এর মাধ্যমে প্রকাশ করলে কোনটি সঠিক? (প্রশ্ন 23)

a.
(2 tan A) / (1 + tan^2 A)
b.
(2 tan A) / (1 - tan^2 A)
c.
(1 - tan^2 A) / (1 + tan^2 A)
d.
(1 + tan^2 A) / (1 - tan^2 A)

Correct answer: c

cos 2A = cos^2 A - sin^2 A = (cos^2 A - sin^2 A) / (cos^2 A + sin^2 A) = (1 - tan^2 A) / (1 + tan^2 A)।

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12272. MCQPractice set · Question 24

গুণিতক কোণ (Multiple angle) cos 2A কে tan A এর মাধ্যমে প্রকাশ করলে কোনটি সঠিক? (প্রশ্ন 24)

a.
(2 tan A) / (1 + tan^2 A)
b.
(2 tan A) / (1 - tan^2 A)
c.
(1 + tan^2 A) / (1 - tan^2 A)
d.
(1 - tan^2 A) / (1 + tan^2 A)

Correct answer: d

cos 2A = cos^2 A - sin^2 A = (cos^2 A - sin^2 A) / (cos^2 A + sin^2 A) = (1 - tan^2 A) / (1 + tan^2 A)।

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12273. MCQPractice set · Question 25

গুণিতক কোণ (Multiple angle) cos 2A কে tan A এর মাধ্যমে প্রকাশ করলে কোনটি সঠিক? (প্রশ্ন 25)

a.
(1 - tan^2 A) / (1 + tan^2 A)
b.
(2 tan A) / (1 + tan^2 A)
c.
(2 tan A) / (1 - tan^2 A)
d.
(1 + tan^2 A) / (1 - tan^2 A)

Correct answer: a

cos 2A = cos^2 A - sin^2 A = (cos^2 A - sin^2 A) / (cos^2 A + sin^2 A) = (1 - tan^2 A) / (1 + tan^2 A)।

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12274. MCQPractice set · Question 26

গুণিতক কোণ (Multiple angle) cos 2A কে tan A এর মাধ্যমে প্রকাশ করলে কোনটি সঠিক? (প্রশ্ন 26)

a.
(2 tan A) / (1 + tan^2 A)
b.
(1 - tan^2 A) / (1 + tan^2 A)
c.
(2 tan A) / (1 - tan^2 A)
d.
(1 + tan^2 A) / (1 - tan^2 A)

Correct answer: b

cos 2A = cos^2 A - sin^2 A = (cos^2 A - sin^2 A) / (cos^2 A + sin^2 A) = (1 - tan^2 A) / (1 + tan^2 A)।

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12275. MCQPractice set · Question 27

গুণিতক কোণ (Multiple angle) cos 2A কে tan A এর মাধ্যমে প্রকাশ করলে কোনটি সঠিক? (প্রশ্ন 27)

a.
(2 tan A) / (1 + tan^2 A)
b.
(2 tan A) / (1 - tan^2 A)
c.
(1 - tan^2 A) / (1 + tan^2 A)
d.
(1 + tan^2 A) / (1 - tan^2 A)

Correct answer: c

cos 2A = cos^2 A - sin^2 A = (cos^2 A - sin^2 A) / (cos^2 A + sin^2 A) = (1 - tan^2 A) / (1 + tan^2 A)।

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12276. MCQPractice set · Question 28

গুণিতক কোণ (Multiple angle) cos 2A কে tan A এর মাধ্যমে প্রকাশ করলে কোনটি সঠিক? (প্রশ্ন 28)

a.
(2 tan A) / (1 + tan^2 A)
b.
(2 tan A) / (1 - tan^2 A)
c.
(1 + tan^2 A) / (1 - tan^2 A)
d.
(1 - tan^2 A) / (1 + tan^2 A)

Correct answer: d

cos 2A = cos^2 A - sin^2 A = (cos^2 A - sin^2 A) / (cos^2 A + sin^2 A) = (1 - tan^2 A) / (1 + tan^2 A)।

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12277. MCQPractice set · Question 29

গুণিতক কোণ (Multiple angle) cos 2A কে tan A এর মাধ্যমে প্রকাশ করলে কোনটি সঠিক? (প্রশ্ন 29)

a.
(1 - tan^2 A) / (1 + tan^2 A)
b.
(2 tan A) / (1 + tan^2 A)
c.
(2 tan A) / (1 - tan^2 A)
d.
(1 + tan^2 A) / (1 - tan^2 A)

Correct answer: a

cos 2A = cos^2 A - sin^2 A = (cos^2 A - sin^2 A) / (cos^2 A + sin^2 A) = (1 - tan^2 A) / (1 + tan^2 A)।

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12278. MCQPractice set · Question 30

গুণিতক কোণ (Multiple angle) cos 2A কে tan A এর মাধ্যমে প্রকাশ করলে কোনটি সঠিক? (প্রশ্ন 30)

a.
(2 tan A) / (1 + tan^2 A)
b.
(1 - tan^2 A) / (1 + tan^2 A)
c.
(2 tan A) / (1 - tan^2 A)
d.
(1 + tan^2 A) / (1 - tan^2 A)

Correct answer: b

cos 2A = cos^2 A - sin^2 A = (cos^2 A - sin^2 A) / (cos^2 A + sin^2 A) = (1 - tan^2 A) / (1 + tan^2 A)।

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12279. MCQPractice set · Question 31

গুণিতক কোণ (Multiple angle) cos 2A কে tan A এর মাধ্যমে প্রকাশ করলে কোনটি সঠিক? (প্রশ্ন 31)

a.
(2 tan A) / (1 + tan^2 A)
b.
(2 tan A) / (1 - tan^2 A)
c.
(1 - tan^2 A) / (1 + tan^2 A)
d.
(1 + tan^2 A) / (1 - tan^2 A)

Correct answer: c

cos 2A = cos^2 A - sin^2 A = (cos^2 A - sin^2 A) / (cos^2 A + sin^2 A) = (1 - tan^2 A) / (1 + tan^2 A)।

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12280. MCQPractice set · Question 32

গুণিতক কোণ (Multiple angle) cos 2A কে tan A এর মাধ্যমে প্রকাশ করলে কোনটি সঠিক? (প্রশ্ন 32)

a.
(2 tan A) / (1 + tan^2 A)
b.
(2 tan A) / (1 - tan^2 A)
c.
(1 + tan^2 A) / (1 - tan^2 A)
d.
(1 - tan^2 A) / (1 + tan^2 A)

Correct answer: d

cos 2A = cos^2 A - sin^2 A = (cos^2 A - sin^2 A) / (cos^2 A + sin^2 A) = (1 - tan^2 A) / (1 + tan^2 A)।

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