Question

what is derivation of x square cos x​

Answer 1

★★Heya★★

Tan ( A + B ) =

Tan A + Tan B
____________
1 - Tan A × Tan B

And

Tan ( A - B ) =

Tan A - Tan B
_____________
1 + Tan A × Tan B .

=>

Q.1

L.H.S

Tan ( π/4 + x )
__________
Tan ( π/4 - x )

=>

Tan π/4 + Tan x
____________
1 - Tan π/4 × Tan x
__________________

Tan π/4 - Tan x
_____________
1 + Tan π/4 × Tan x

=>

{1 + Tan x }²
__________
{ 1 - Tan x }²

Becoz Tan π/4 = 1

Q.2

F ( x ) = x² × Cos x

Using product rule of Differentiation we have

F' ( x ) = 2x × Cos x + x² ( - Sin x )

=>

F' ( x ) = 2x × Cos x - x² Sin x

Answer 2

Answer:

Step-by-step explanation: