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question mark

If Sin2A=Sin3A, then value of A is:
A. 18
B. 36
C. 54
D. 72

Pushpa Raj Joshi , 5 Years ago
Grade 12th pass
anser 2 Answers
Aditya Gupta

Last Activity: 5 Years ago

hello pushpa. this ques can be easily solved as follows
sin2A= sin3A
2A= 3A or A= 0 (not given in options).
so we try another approach
we use the formula sinx= sin(180 – x)
so, sin2A= sin3A= sin(180 – 3A)
so 2A= 180 – 3A
or A= 180/5
or A= 36 deg
option B
kindly approve :)

Saurabh Koranglekar

Last Activity: 5 Years ago

Dear student

Sin ( 90- x ) = sin ( 90 + x)

2a= 90-x

3a = 90+x

5a = 180

a= 36

Regards

star
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