Mathematics
Without using trigonometric tables, find the values of; (i) (ii) (iii) (iv) 4(sin4 30 + cos4 60 ) - 3 (cos2 45 - sin2 90 )
Related Questions
Without using trigonometric table, find the values of:
(i) sin 60° cos 30° + cos 60° sin 30°
(ii) sin 45° cos 30° - cos 45° sin 30°
(iii) cos 60° cos 45° + sin 60° sin 45°
(iv) cos 90° + cos2 45° sin 30° tan 45°
Verify each of the following :
(i) sin 60° cos 30° - cos 60° sin 30° = sin 30°
(ii) 2 sin 30° cos 30° = sin 60°
(iii) 2 sin 45° cos 45° = sin 90°