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Mathematics
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Hipo
  • Member for 4 years, 2 months
  • Last seen more than 3 years ago
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3
One of the angles of a trapezoid $ABCD$ is $30^\circ$ and its diagonals are perpendicular to each other
May 11, 2022
2
If $\alpha<45^\circ$, then $\tan\alpha<\cot\alpha$ using unit circe
Mar 12, 2022
2
Parallelogram with an angle and the midpoint of a side
Apr 4, 2022
2
$\frac{1}{a+b}+\frac{1}{a+c}=\frac{3}{a+b+c}$ in a triangle
Apr 13, 2022
2
Show that $\sin47^\circ+\sin61^\circ-\sin11^\circ-\sin25^\circ=\cos7^\circ$ [duplicate]
May 10, 2022
2
Prove that $\frac{\sin4\alpha}{1+\cos4\alpha}\cdot\frac{\cos2\alpha}{1+\cos2\alpha}=\cot\left(\frac{3\pi}{2}-\alpha\right)$
May 29, 2022
1
$\sin2\alpha$ in terms of $\tan\alpha$
Feb 4, 2022
1
Trapezoid perimeter
Feb 12, 2022
1
Right trapezoid with an acute angle $60^\circ$
Feb 15, 2022
1
Regular pentagon and diagonals
Mar 1, 2022