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प्रश्न
Find all values of x such that – 6π ≤ x ≤ 6π and cos x = 0
उत्तर
cos x = 0
cos x = `cos pi/2`
⇒ x = `(2"n" + 1) +- pi/2`
n = 0, ±1, ±2, ±3, ±4, ±5
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