Question

if (x) = cosecx + cotx find f'(π/4)​

Answer 1

Heya

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f'(x) = - Cosec( x ) × Cot( x ) - Cosec² ( x )

=>

f'(π/4) = -√2 × 1 - ( √2 )²

=>

f'(π/4) = - ( √2 + 2 )

=>

f'(π/4 ) = -√2 { 1 + √2 }