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01-01-2021
Mathematics

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what's the name of this communicate
sin2a+cos2a=1

Respuesta :

01-01-2021

Answer:

sin2A +cos2A=1. Its a standard identity.

We know that sinA= H B

--- and cos A=----

P H

Hence sin² A= P² B²

----- and cos²A -----

H² H²

Hence adding the above given functions sin²A+cos²A we get

H²

sin²A+cos²A = -------- =1

H²

Using P² +B²=H² by Pythagoras Theorem

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