Question

Cos square 67°- sin square B

Answer 1

$cos {}^{2}67 \: - \: sin { }^{2}b \: = 0 \\ cos {}^{2} 67 = sin {}^{2} b \\ cos67 = sin23 \\ sin {}^{2} 23 = sin {}^{2} b \\ then \: b = 23$
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