Math Is Fun Forum

Zeeshan 01

Member

Registered: 2016-07-22

Posts: 746

Question trigonometry

Why (sin thitha )2 is not equal to sin thitha2
But why we write sin^2 thitha

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Malik

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Question trigonometry

You mean

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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.

zetafunc

Moderator

Registered: 2014-05-21

Posts: 2,440

Website

Re: Question trigonometry

For illustrative purposes, let's consider instead the function

Then

but

Clearly it is not true that

In the same vein, if

, then

but

and so the two are not equal.

Zeeshan 01

Member

Registered: 2016-07-22

Posts: 746

Re: Question trigonometry

Yes i mean sin(thita)

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Malik

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Question trigonometry

Parentheses mean different things in math in different situations.

Sometimes parentheses are used for grouping like this (a-b) this is not the same as sin(x). Here the parentheses are being used as the argument to the sin function.

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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.

zetafunc

Moderator

Registered: 2014-05-21

Posts: 2,440

Website

Re: Question trigonometry

Just in case you were not aware,

and

are the same thing -- the former is just more acceptable.

thickhead

Member

Registered: 2016-04-16

Posts: 1,086

Re: Question trigonometry

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{1}Vasudhaiva Kutumakam.{The whole Universe is a family.}
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{Gods rejoice at those places where ladies are respected.}