फलन sin x + cos x का उच्चतम मान क्या है?
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Given : f(x) = Sinx + Cosx
To find : उच्चतम मान ज्ञात कीजिए
Solution:
f(x) = Sinx + Cosx
f'(x) = Cosx - Sinx
f'(x) = 0
=> Cosx - Sinx = 0
=> Cosx = Sinx
=> Tanx = 1
=> x = π/4
f'(x) = Cosx - Sinx
f''(x) = -Sinx - Cosx
x = π/4 पर
f''(x) = -Sin(π/4) - Cos(π/4)
= - 1/√2 - 1/√2
= -2/√2
= -√2 < 0
x = π/4 पर f''(x) < 0
=> x = π/4 f(x) का उच्चतम मान है
f(π/4) = Sin(π/4) + Cos(π/4)
= 1/√2 + 1/√2
= 2/√2
= √2
फलन sin x + cos x का उच्चतम मान = √2
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