Trigonometry Question: Find the Value of sin(α +2β) When cot (α + β) = 0

[mia5]

Homework Statement

If cot (α + β) = 0 then sin(α +2β) is
the options are
a. sin α b. cos α c. sin β d. cos 2β

Homework Equations

There is as such no equation

The Attempt at a Solution

I did try to solve it but I kept arriving at the wrong answer. The correct answer is c. sin β while the answer I keep getting is a. sin α

 

[CompuChip]

Maybe you can show us what you have so far, and we can try to find the error.

 

[ehild]

Are you sure that c) is the correct answer? Try with α=60° and β=30°. I think your result is the correct one.

ehild

 

[Curious3141]

Homework Statement

If cot (α + β) = 0 then sin(α +2β) is
the options are
a. sin α b. cos α c. sin β d. cos 2β

Homework Equations

There is as such no equation

The Attempt at a Solution

I did try to solve it but I kept arriving at the wrong answer. The correct answer is c. sin β while the answer I keep getting is a. sin α

Your answer (sin α) is correct.