How do you simplify $sin^2x sin^2x$ ?

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Answer 1 · 2016-05-07T15:33:43

$sin^4 x$

$sin^2x.sin^2 x = sin^4 x$

Answer 2 · 2016-05-07T15:46:29

$cos^4x^2$ -2 $cos^2x$ +1=0

the formula is $sin^2x$ + $cos^2x$ =1

$sin^2x$ =1- $cos^2x$

Substitute this instead of $sin^2x$ $sin^2x$

The equation is now like this:

(1- $cos^2x$ )(1- $cos^2x$ )=0

Multiply out the brackets:

1- $cos^2x$ - $cos^2x$ + $cos^4x^2$

Group like terms and put them in the right order:

$cos^4x^2$ -2 $cos^2x$ +1=0

How do you simplify sin^2x sin^2xsin^2x sin^2x?