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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)

Anushka Mishra , 7 Years ago
Grade 12th pass
anser 1 Answers
Ritesh Khatri

Last Activity: 7 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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