If $ \tan (A-B)=\frac{1}{\sqrt{3}} $ and $ \tan (A+B)=\sqrt{3}, 0^{\circ} < A+B \leq 90^{\circ}, A>B $ find $ A $ and $ B $.
Given:
\( \tan (A-B)=\frac{1}{\sqrt{3}} \) and \( \tan (A+B)=\sqrt{3}, 0^{\circ} < A+B \leq 90^{\circ}, A>B \)
To do:
We have to find $A$ and $B$.
Solution:
$\tan (A-B)=\frac{1}{\sqrt3}$
$\tan (A-B)=\tan 30^{\circ}$ (Since $\tan 30^{\circ}=\frac{1}{\sqrt3}$)
$\Rightarrow A-B=30^{\circ}$......(i)
$\tan (A+B)=\sqrt3$
$\tan (A+B)=\tan 60^{\circ}$ (Since $\tan 60^{\circ}=\sqrt3$)
$\Rightarrow A+B=60^{\circ}$
$\Rightarrow A=60^{\circ}-B$........(ii)
Substituting (ii) in (i), we get,
$60^{\circ}-B-B=30^{\circ}$
$\Rightarrow 2B=30^{\circ}$
$\Rightarrow B=\frac{30^{\circ}}{2}$
$\Rightarrow B=15^{\circ}$
$\Rightarrow A=60^{\circ}-15^{\circ}=45^{\circ}$
The values of $A$ and $B$ are $45^{\circ}$ and $15^{\circ}$ respectively.
Related Articles
- If \( A=B=60^{\circ} \), verify that\( \tan (A-B)=\frac{\tan A-\tan B}{1+\tan A \tan B} \)
- If \( \tan (\mathbf{A}+\mathbf{B})=1 \) and \( \tan (\mathbf{A}-\mathbf{B})=\frac{1}{\sqrt3}, 0^{\circ} < A + B < 90^{\circ}, A > B, \) then find the values of \( \mathbf{A} \) and \( \mathbf{B} \).
- If \( A \) and \( B \) are acute angles such that \( \tan A=\frac{1}{2}, \tan B=\frac{1}{3} \) and \( \tan (A+B)=\frac{\tan A+\tan B}{1-\tan A \tan B} \), find \( A+B \).
- If \( \sin (A+B)=1 \) and \( \cos (A-B)=1,0^{\circ} < A + B \leq 90^{\circ}, A \geq B \) find A and B.
- If $tan\ (A + B) = \sqrt3$ and $tan\ (A - B) = \frac{1}{\sqrt3}$; $0^o < A + B ≤ 90^o; A > B$, find $A$ and $B$.
- The value of \( \left(\tan 1^{\circ} \tan 2^{\circ} \tan 3^{\circ} \ldots \tan 89^{\circ}\right) \) is(A) 0(B) 1(C) 2(D) \( \frac{1}{2} \)
- Show that \( \frac{a \sqrt{b}-b \sqrt{a}}{a \sqrt{b}+b \sqrt{a}}=\frac{1}{a-b}(a+b-2 \sqrt{a b}) \)
- Find acute angles \( A \) and \( B \), if \( \sin (A+2 B)=\frac{\sqrt{3}}{2} \) and \( \cos (A+4 B)=0, A>B \).
- Choose the correct option and justify your choice:(i) \( \frac{2 \tan 30^{\circ}}{1+\tan ^{2} 30^{\circ}}= \)(A) \( \sin 60^{\circ} \) (B) \( \cos 60^{\circ} \) (C) \( \tan 60^{\circ} \) (D) \( \sin 30^{\circ} \)(ii) \( \frac{1-\tan ^{2} 45^{\circ}}{1+\tan ^{2} 45^{\circ}}= \)(A) \( \tan 90^{\circ} \) (B) 1 (C) \( \sin 45^{\circ} \) (D) 0(iii) \( \sin 2 \mathrm{~A}=2 \sin \mathrm{A} \) is true when \( \mathrm{A}= \)(A) \( 0^{\circ} \) (B) \( 30^{\circ} \) (C) \( 45^{\circ} \) (D) \( 60^{\circ} \)(iv) \( \frac{2 \tan 30^{\circ}}{1-\tan ^{2} 30^{\circ}}= \)(A) \( \cos 60^{\circ} \) (B) \( \sin 60^{\circ} \) (C) \( \tan 60^{\circ} \) (D) \( \sin 30^{\circ} \).
- Find the value of $a \times b$ if \( \frac{3+2 \sqrt{3}}{3-2 \sqrt{3}}=a+b \sqrt{3} \).
- In each of the following determine rational numbers $a$ and $b$:\( \frac{\sqrt{3}-1}{\sqrt{3}+1}=a-b \sqrt{3} \)
- Prove that:\( \frac{\tan A+\tan B}{\cot A+\cot B}=\tan A \tan B \)
- Solve: \( \frac{\sqrt{x+a}+\sqrt{x-b}}{\sqrt{x+a}-\sqrt{x-b}}=\frac{a+b}{a-b}(a \eq b) \)
- Prove that:\( \frac{\cot A+\tan B}{\cot B+\tan A}=\cot A \tan B \)
- If $\frac{7+\sqrt{5}}{7-\sqrt{5}}=a+b \sqrt{5}$, find a and b.
Kickstart Your Career
Get certified by completing the course
Get Started