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Grade: 12th pass

                        

2 cos thetha-sin thetha= 1/√2 Find the value of 2sin thetha+ cos thetha

5 months ago

Answers : (2)

Saurabh Koranglekar
askIITians Faculty
8393 Points
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5 months ago
Aditya Gupta
2056 Points
							
the above ans is wrong. correct method:
2C – S= 1/sqrt2
let 2S+C= k, where C= cosx and S= sinx
squaring and adding 
4C^2+S^2 – 4CS + 4S^2+C^2+4SC= ½ + k^2
5(S^2+C^2) – ½ = k^2
k^2= 9/2
or k= ± 3/sqrt2
KINDLY APPROVE :))
5 months ago
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