The value of cos 15° – sin 15° is (1) 1/√2 (2) -1/√2 (3) 1/2√2 (4) 0
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Answer: 1/2 is correct answer
Step-by-step explanation:
= cos15°-sin15°
= cos15°-cos(90°-15°) (∴ cos90°-∅ = sin∅)
= cos( 15°-90°+15°)
= cos(-60°)
= cos60° (∴cos60°=1/2)
= 1/2
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