Question

if x=15°. evaluate
(4 cos 2x) (sin 4 x) (tan 3x)-1​

Answer 1

Step-by-step explanation:

(4cos2x) (sin4x) (tanx3x) -1

if x=15°

(4cos2×15°) (sin4×15) (tan3×15) - 1

(4 cos30°) (sin60°) (tan45°) - 1

4×√3/2 ×√3/2 ×1 - 1

4×3/4 - 1

3-1

2