(x sin a + y cos a)^2 + (x cos a – y sin a)^2 = x^2 + y^2

Proved

Step-by-step explanation:

Required

Prove that:

Solving from left to right:

Open brackets

Collect Like Terms

Collect Like Terms

Factorize:

Further factorize

In trigonometry:

So, we have:

Proved

answer: given that the roller coaster can accommodate 1600 riders per hour, thus the roller coaster can accomodate 1600 / 60 = 26.67 riders per minute.

given that there are 345 people in the line, the number of minutes it will take for the 345 persons to get into the roller coaster is given by 345 / 26.67 = 12.94 minutes.

therefore, it will take you 12.94 minutes to get to the front of the line.

step-by-step explanation:

step-by-step explanation:

most likely the answer is a.

alice wins if a total of 5 is rolled. finn wins if a total of 9 is rolled.