Question

(iii) If A = 45°, find sin 3A – cos 3A​

Answer 1

Answer:

Sin3A - Cos3A

= 3×( SinA - CosA)

= 3× ( Sin45°-Cos45°)

= 3× ( 1/√2 - 1/√2)

= 3×1

.°. = 3