Given:
(sin 72° + cos 18°) (sin 72° - cos 18°)
Formula Used:
cos A = sin (90-A)
Solution:
=> (sin 72° + cos 18°) (sin 72° – cos 18°)
=> (sin 72° + cos 18°) [sin 72° – cos (90 - 72°)]
=> (sin 72° + cos 18°) [sin 72° – sin 72°]
=> (sin 72° + cos 18°) × 0
=> 0
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