Question

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

Answer 1

Answer:

(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

Answer 2

Answer:

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