Question

If cos (α + β) = 0, then sin (α – β) can be reduced to

Answer 1

Just to solve the example in an exam, take example such as
$\alpha = 60 \: and \: \beta = 30$
so the values satisfies the equation then we can write
$\sin(60 - 30) = \sin(30 ) = 1 \div 2$

Answer 2

Answer:

Just to solve the example in an exam, take example such as

so the values satisfies the equation then we can write

Step-by-step explanation: