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0:17:34

AMC 10 Prep Class 2 Covid9Teen

0:49:05

AMC 10 Prep Class 1 Covid9Teen

0:05:50

How to simplify 'asinx+bcosx' in only sine? (a and b are both positive or negative)

0:07:15

AOIME (AIME 2020) Question 11

0:05:18

Sine Law--What and Why?

0:03:21

S and t are real numbers, satisfy 19s^2+99s+1, t^2+99t+19=0. s≠0, st≠0 What is (st+4s+1)/(t)?

0:06:36

Angle Bisector Theorem—What and Why?

0:05:29

Angle at the centre theorem (central angle theorem)—What and Why?

0:02:38

Alternate Segment Theorem—What and Why?

0:02:49

AM ≥ GM—What and Why?

0:02:59

The second way to solve:' If x+y+z=5 and xy+yz+xz=3, what is the max and min of z?'

0:02:56

Vieta’s Formula--What and why?

0:02:57

If x+y+z=5 and xy+yz+xz=3, what is the max and min of z?

0:03:01

Inequality Question

0:02:43

CMO (Canadian Mathematic Olympiad) 1969, #5

0:02:42

What is the value of cos20°×cos40°×cos80°?