Problema Solution
Which value of x solves the equation cos x° = sin (20° + x°), where
0 < x < 90?
Answer provided by our tutors
cos x° = sin (20° + x°)
since cos x° = sin (90 - x)° we can write
sin (90 - x)° = sin (20° + x°)
since 0<x<90 we have
90 - x = 20 + x
by solving we find
x = 35°
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