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The answer is option c can someone please explain how it can be solved? 13568293639976662221111111111111111111111111111(writing anything to complete the 50 characters limit)

The answer is option c can someone please explain how it can be solved? 13568293639976662221111111111111111111111111111(writing anything to complete the 50 characters limit)

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Grade:12th pass

1 Answers

Ritesh Khatri
76 Points
6 years ago
[sinx + cosx] = [\sqrt{2}sin(\frac{\pi}{4}+x)]
Now for x belongs to 0 to Pi/4 (=0.785) 
[\sqrt{2}sin(\frac{\pi}{4}+x)] = 1
LHS = 1
for x belongs to 0 to Pi/4 (=0.785) 
[-sinx] = -1
[-cosx] = -1
RHS = 3-1-1 = 1
Therefore for all values between 0 and 0.785 above expression is true.
Similarly we can check for remaining range

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