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DINESH BABU

· started a discussion

· 1 Months ago

pls explain (Question: 221500.0 )

pls explain the first step

Question:
If \(\theta\) = 60°, \(\cfrac{1}{2} \ \sqrt{1 + sin \ \theta} + \cfrac{1}{2}\ \sqrt{1 - sin \ \theta} \)    then  is equal to - 
Options:
A) cot \(\cfrac{\theta}{2}\)
B) sec \(\cfrac{\theta}{2}\)
C) sin \(\cfrac{\theta}{2}\)
D) cos \(\cfrac{\theta}{2}\)
Solution:
Ans: (d)

Just apply the trigonometric formula:
1+sinx = [sinx/2 + cosx/2]^2

Now,


Knowledge Expert

· commented

· 1 Months ago

Dear student,
Just apply the trigonometric formula:
1+sinx = [sinx/2 + cosx/2]^2
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lalit kataria

· commented

· 1 Months ago

why option (c) is not an answer of this question
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