Math, asked by Tamrakarsiddha5100, 9 months ago

फलन sin x + cos x का उच्चतम मान क्या है?

Answers

Answered by amitnrw
0

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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