Find the value of :
3 sin2 30° + 2 tan2 60° - 5 cos2 45°
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tan2 30° + tan2 45° + tan2 60°
Prove that :
sin 60° cos 30° + cos 60°. sin 30° = 1
cos 30°. cos 60° - sin 30°. sin 60° = 0