What is the value of cos square 67 degree minus sin square 23 degrees?
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⇒cos²67° - sin²23° {∴, sin²θ= (90°- cos²θ)}
⇒(90°- cos²67°) - sin²23°
⇒sin²23° - sin²23°
⇒0
⇒(90°- cos²67°) - sin²23°
⇒sin²23° - sin²23°
⇒0
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