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Q: What is sin squared equal to?

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You can use the Pythagorean identity to solve this:(sin theta) squared + (cos theta) squared = 1.

Yes. Both expressions are the same.

In a right angled triangle its hypotenuse when squared is equal to the sum of its squared sides which is Pythagoras' theorem for a right angle triangle.

cos 71

Sin(x) cos(x) = 1/2 of sin(2x)

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Note that an angle should always be specified - for example, 1 - cos square x. Due to the Pythagorean formula, this can be simplified as sin square x. Note that sin square x is a shortcut of (sin x) squared.

It is 2*sin(theta)*sin(theta) because that is how multiplication is defined!

Yes. Except where sin x = 0, because then you would be dividing by zero so the quotient is undefined.

2 x cosine squared x -1 which also equals cos (2x)

Cos^2 x = 1 - sin^2 x

Sin squared, cos squared...you removed the x in the equation.

Answer 1 Put simply, sine squared is sinX x sinX. However, sine is a function, so the real question must be 'what is sinx squared' or 'what is sin squared x': 'Sin(x) squared' would be sin(x^2), i.e. the 'x' is squared before performing the function sin. 'Sin squared x' would be sin^2(x) i.e. sin squared times sin squared: sin(x) x sin(x). This can also be written as (sinx)^2 but means exactly the same. Answer 2 Sine squared is sin^2(x). If the power was placed like this sin(x)^2, then the X is what is being squared. If it's sin^2(x) it's telling you they want sin(x) times sin(x).

Yes. 'sin2x + cos2x = 1' is one of the most basic identities in trigonometry.

sin x times sin x. or 1/cosec2(x) or 1 - cos2(x) or tan2(x)*cos2(x) etc, etc.

sin squared

sin cubed + cos cubed (sin + cos)( sin squared - sin.cos + cos squared) (sin + cos)(1 + sin.cos)

1 - 2cos2(x) and also 2sin2(x) - 1 Take your choice. Use whichever one is more convenient.