Question

1. Evaluate :
(i) cos 30° cos 60° - sin 30° sin 60°
(ii) sin 60° cos 30° + sin 30° cos 60°
(iii) cos 45º cos 60° - sin 45º cos 60°
(iv) 4 cot?60° + sec-30° - sin45°
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Answer 1

i)√3/4-√3/4=0

ii)3/4+1/4=1

iii)1/2√2-1/2√2=0

iv)4*1/√3+2/√3-1/√2=4√3/3 + 2√3/3-√2/2

Now solve it yourself for your practice