Question

( sin 72 + cos 18 ) ( sin 72 - cos 18)



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Answer 1

Step-by-step explanation:

(sin 72˚ + cos 18˚)(sin 72˚ – cos 18˚)

= [sin (90˚ – 18˚) + cos 18˚][sin (90˚ – 18˚) – cos 18˚]

= [cos 18˚ + cos 18˚][cos 18˚ – cos 18˚]

= 0

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Answer 2

Answer:

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