Math Is Fun Forum

lqq889

Member

Registered: 2012-03-05

Posts: 15

Please help on trigonometry question, thanks

A curve

meets x-axis at A, find the x-coordinate of A, leave your answer in pi form.

Answer : x = pi/12

Please show me how to solve this, thanks.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: Please help on trigonometry question, thanks

Hi lqq889

First, transform the sec(x) into a sin(x), and then solve for sin(x). Post your results

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“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

lqq889

Member

Registered: 2012-03-05

Posts: 15

Re: Please help on trigonometry question, thanks

Hi anonimnystefy,
How to transform the sec (x) into sin (x), and how to get rid of the power, can you tell me more detail about this, thanks.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: Please help on trigonometry question, thanks

Hi lqq889

Since we are looking for a point on the x-axis, the y coordinate will be 0, so:

Can you solve these now?

Last edited by anonimnystefy (2012-07-21 14:14:11)

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“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

lqq889

Member

Registered: 2012-03-05

Posts: 15

Re: Please help on trigonometry question, thanks

Hi anonimnystefy,

Thanks for your help, but i want to correct you that, the sec x no equal to 1/sin x its equal to 1/cos x.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Please help on trigonometry question, thanks

Hi;

Just a typo. He meant:

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: Please help on trigonometry question, thanks

Yes, I have mistaken sec(x) for the reciprocal of sin(x). My bad.

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“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.