3 years ago

Sin(5x+15)=cos(4x−6)

Mathematics

1 answer:

Thepotemich [5.8K]3 years ago

8 0

Answer:

Step-by-step explanation:

you know ; for all reals a ; cos(π/2 - a) = sin(a)

so : sin(5x+15) = cos(π/2-(5x+15) ) = cos(π/2-5x-15)

sin(5x+15)=cos(4x−6) eqivaut : cos(π/2-5x-15) = cos(4x−6)

note : cos(a)=cos(b) : a= b +2kπ or a= - b +2kπ ....k in Z

π/2-5x-15 = 4x−6 + 2kπ or π/2-5x-15 = - (4x−6) + 2kπ....k in Z

continue calculate : x .......

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