Answer:
Step-by-step explanation:
sin x=a+b
cos x=a-b
sin²x+cos²x=(a+b)²+(a-b)²=2a²+2b²
or 2a²+2b²=1
a²+b²=1/2 which is constant for all values of x
(ii)
Answer:25
B
Do the math
5x1 is 5
4x1 is 4
35÷7 is 5
28÷7 is 4
Hope this helps