If sin 3y cos 2y and 0o leq 90o find the value ... - WAEC Mathematics 2010 Question
If sin 3y = cos 2y and 0o \(\leq\) 90o, find the value of y
A
18o
B
36o
C
54o
D
90o
correct option: a
sin 3y = cos 2y, but sin (\theta) = cos(90 - (\theta))
sin 3y = cos(90 - 3y)
cos(90 - 3y) = cos 2y
90 - 3y = 2y
5y = 90
y = (\frac{90}{5})
y = 18o
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