Question

cot (45 + theta).cos (45- theta)​

Answer 1

Answer:

COST(45°+0)-COS(45°-0)

=COS(90°-(45°+0))-COS(45°-0)

=COS(90°-45°-0)-COS(45°-0)

=COS(45°-0)=COS(45°-0)

=0