evaluate (sin27° ÷ cos 63° )2 - (cos63° ÷ sin 27°)2
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(sin27° ÷ cos 63° )² - (cos63° ÷ sin 27°)²
= [sin 27° / sin(90°-63°)]² - [cos 63° / cos(90°-27°)]²
= [sin 27°/sin 27°]² - [cos 63°/cos 63°]²
= 1² - 1²
= 1 - 1
= 0.
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