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.
Answer:
SAS Similarity
Step-by-step explanation:
given by lines 1, 2, & 3
Answer:
15 - 3 (expression)
15 - 3 = x (equation)
Step-by-step explanation: