August 2018 1 17 Report
1. x= r sin A cos B
y= r sin A sin B
z= r cos A
maka..
a. x"2 + y"2 + z"2 = r"2
b. x"2 - y"2 + z"2 = r"2
c. x"2 + y"2 - z"2 = r"2
d. - x"2 + y"2 + z"2 = r"2
e. - x"2 - y"2 + z"2 = r"2


2. jika cot a + cos a = x dan cot a - cos a = y. maka (x"2 - y"2) =....

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