nurzierah27 nurzierah27

03-11-2019
Mathematics

contestada

Prove, cotx -tanx= 2 cot2x

Respuesta :

2002hemal 2002hemal

03-11-2019

Step-by-step explanation:

cotx- tanx= 2cot2x

L.H.S

cosx/sinx- sinx/cosx

(cos²x- sin²x)/ sinxcosx

[ cos²x-(1-cos²x)]/sinxcosx

( 2cos²x-1)/sinxcosx

2cosx/ 2sinxcosx

2cot2x

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