sin2 30° + 4 cot2 45° – sec2 60° = ?

Consider sin2 30° + 4 cot2 45° – sec2 60° = (1/2)2 + 4(1)2 – (2)2= (1/4) + 4 – 4= 1/4

Q28 of 186 Page 350

sin² 30° + 4 cot² 45° – sec² 60° = ?

Consider sin² 30° + 4 cot² 45° – sec² 60° = (1/2)² + 4(1)² – (2)²

= (1/4) + 4 – 4

= 1/4

sec²60° – 1 = ?

(cos 0° + sin 30° + sin 45°) (sin 90° + cos 60° – cos 45°) = ?

3 cos²60° + 2 cot²30° – 5 sin²45° = ?

cos² 30° cos² 45° + 4 sec² 60° + 2cos² 90° – 2 tan² 60° = ?