Answer:
34
Step-by-step explanation:
5 1/10=5.1=5.10
5.10÷0.15
=510÷15
=34
2: c
Step-by-step explanation:
3: a
by Supplementing each answer Into the equation
I'd be glad to help but i don't know the question
D
using the double - angle identity
cos (2A) = cos² A - sin² A = 2cos² A - 1 = 1 - 2sin² A
the right side = 1 - 2sin² (112.5° ) with A = 22.5°
hence 2A = 2 × 22.5° = 45°
thus cos 45° = 1 - 2sin² ( 22.5°)
