The distance formula is derived from the Pythagorean Theorem because the length of one leg of the triangle will always be the difference of the x-coordinates, and the length of the other leg will always be the difference in the y-coordinates<span>
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Answer:
-90 , 30
Step-by-step explanation:
sina = cos(2a)
= 1 - 2(sina)^2
2(sina)^2 + sina -- 1 = 0
( sina + 1 )( 2sina - 1 ) = 0
sina = -1 or sina = 1/2
=> a = -90 degrees or => a = 30 degrees
Answer:
5 5 ABCD added to 55 110 two ten