67) If tan 20° = P then prove that
tan 610° +tan 700° 1-p?
"tan 560° – tan 470° 1+ p?
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Step-by-step explanation:
tan 610° +tan 700° = tan (360° +250°) + tan (720° -20° ) = tan 250° - tan 20°
= tan 70° - tan 20° = cot 20° - tan 20° = 1/p - p
furthermore
tan 560° – tan 470° = tan 200° – tan 110° = tan 20° + tan 70°
= tan 20° + cot 20° = p + 1/p
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