sin(-x)=-cos(x) for… - QuestionCove

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Mathematics 13 Online

OpenStudy (anonymous):

sin(-x)=-cos(x) for all values of x. true of false?

11 years ago

OpenStudy (anonymous):

@JackJordan

11 years ago

ganeshie8 (ganeshie8):

plugin \(x = 0\) and see if the equation satisfies

11 years ago

OpenStudy (anonymous):

thank you! got the answer i was looking for!! I will definitely be @ ing you a lot more tonight!

11 years ago

ganeshie8 (ganeshie8):

Awesome! may i knw the answer you got

11 years ago

OpenStudy (anonymous):

it was false. right?

11 years ago

ganeshie8 (ganeshie8):

Yep! good job!

11 years ago

OpenStudy (anonymous):

Yeah, there are better ways to see why. One would be to draw the graphs... another is to realise that sin(-x) = -sin(x) so the question really is sin(x) = cos(x) which is false :P

11 years ago

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