4. Find the value of angle A, if [3]
i) Sin2A =1 ii) 2 sin2A = 1 iii) 2 sin A = 1
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Answer:
i) sin 2a=1
sin2a=sin 90
sin a=sin 90/2
sin a=sin 45
a=45
ii)2 sin2a=1
sin 2a=1/2
sin 2a=sin30
sin a=sin 30/2
sin a=sin 15
a=15
iii) 2sin a=1
sin a=1/2
sin a=sin 30
a=30
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