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C
the sum to infinity of a geometric series =
where a is the first term and r the common ratio
= = 81 × 3 = 243
Answer:
sin(x) and cos(y) are equal and have ratio of 1 : 1
First find the missing hypotenuse using Pythagoras theorem:
a² + b² = c²
12² + 5² = c²
c = √144+25
c = 13
using sine rule:
using cosine rule: