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Trigonometry (Basic)
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Trigonometry (Basic)
All Questions (Page: 13)
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All Questions (PDF)
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Study Material (PDF)
All Questions (PDF)
Self Assesment
Sort As
Serial Number
Newly Added
Language
English
Bengali
Click on each question to see answer & solution.
Question No: #121
যদি `sin 2\alpha = cos \alpha` হয়, তাহলে `tan \alpha` -এর মান হবে ....... ।
Ans: `1/\sqrt{3}`
SEE SOLUTION
Question No: #122
`sin 3\theta = cos (2\theta + 45^\circ)` হলে, `tan 5\theta` এর মান হবে -
(a) `\sqrt{3}`, (b) `1`, (c) `\frac{1}{\sqrt{3}}`, (d) অসংজ্ঞাত
Ans: (b) `1`
SEE SOLUTION
Question No: #123
`sin (2x+y) = cos (4x-y)` হলে, `tan 3x` এর মান নির্ণয় করো।
Ans: `1`
SEE SOLUTION
Question No: #124
`sin (5x-18^\circ) = cos (5y+28^\circ)` হলে, `x+y` এর মান নির্ণয় করো।
Ans: `16^\circ`
SEE SOLUTION
Question No: #125
প্রমাণ করো যে, `tan 7^\circ tan 23^\circ tan 60^\circ tan 67^\circ tan 83^\circ = \sqrt{3}` ।
Ans:
SEE SOLUTION
Question No: #126
প্রমাণ করো যে, `tan 15^\circ + tan 75^\circ = \frac{sec^2 15^\circ}{\sqrt{sec^2 15^\circ - 1}}`
Ans:
SEE SOLUTION
Question No: #127
প্রমাণ করো যে, `\frac{sin 52^\circ + cos 38^\circ}{sin 38^\circ + cos 52^\circ} = tan 52^\circ` ।
Ans:
SEE SOLUTION
Question No: #128
দেখাও যে, `\text{cosec}^2 22^\circ cot^2 68^\circ = sin^2 22^\circ + sin^2 68^\circ + cot^2 68^\circ` ।
Ans:
SEE SOLUTION
Question No: #129
দেখাও যে, `\frac{tan 57^\circ + cot 37^\circ}{tan 33^\circ + cot 53^\circ} = tan 57^\circ cot 37^\circ` ।
Ans:
SEE SOLUTION
Question No: #130
প্রমাণ করো যে, `\frac{tan 47^\circ + cot 27^\circ}{tan 43^\circ + cot 63^\circ} = cot 43^\circ cot 27^\circ` ।
Ans:
SEE SOLUTION
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