Find the value of:
sin 30° cos 30°
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sin 30° cos 30°=12×32=34\text{sin 30° cos 30°} = \dfrac{1}{2} \times \dfrac{\sqrt3}{2}\\[1em] = \dfrac{\sqrt3}{4}\\[1em]sin 30° cos 30°=21×23=43
Hence, sin 30° cos 30° = 34\dfrac{\sqrt3}{4}43.
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The value of :
cos2 60° - 2 sin3 30° + 3 cot4 45° is :
1
-2
3
2
The value of cos 60° - cos 0°+2 sin 90° cot 60°× cot 30°\dfrac{\text{cos 60° - cos 0°} + \text{2 sin 90°}}{\text{ cot 60°}\times \text{ cot 30°}} cot 60°× cot 30°cos 60° - cos 0°+2 sin 90° is :
1121\dfrac{1}{2}121
23\dfrac{2}{3}32
tan 30° tan 60°
cos2 60° + sin2 30°
