Can you guys help bdoggaming reach 1k subs?

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

When a rectangle is dilated, how do the perimeter and area of the rectangle change?

When you have 25 numbers, and jake picks 3 random numbers and puts them back, what is the chance bob has of picking those 3 numbers when he picks 6 random numbers (without putting them back)? explain.