Rule of trigonometric functions:-
sin a = cos(90 - a)
Here a = 90°.
sin 90 = cos (90 - 90)
1 = cos 0.
cos 0 = 1.
So the cos 0 = 1.
The percentage that the store has taken off would be 30%.
Answer:
A=-20 B=20
Step-by-step explanation:
Bothell are proportional
