Q.

Find x:  tan 3x = sin 45º cos 45º + sin 30º

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a

45°

b

20°

c

15°

d

None of these

answer is A.

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Detailed Solution

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Given , tan 3x = sin 45º cos 45º + sin 30º

Putting the values of sin 45º, cos 45º and sin 30º, we get:
=> tan 3x = 12×12+12
=> tan 3x = 12+12
=> tan 3x = 1
=> tan 3x = tan 45º
=> 3x = 45º    

=> x = 15º

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Find x:  tan 3x = sin 45º cos 45º + sin 30º