Thursday

August 21, 2014

August 21, 2014

Posted by **aaa** on Monday, February 4, 2013 at 3:35am.

- math(Trigonometry) -
**Steve**, Monday, February 4, 2013 at 5:22am2(1-sin^2) + 5sin - 4 = 0

2sin^2 - 5sin + 2 = 0

(2sin-1)(sin-2) = 0

sin = 1/2 or 2

...

- math(Trigonometry) -
**aaa**, Monday, February 4, 2013 at 6:08amcan give me a further and detail explanation where did the theta on the 5 and the formula on changing the cos theta.

- math(Trigonometry) -
**Steve**, Monday, February 4, 2013 at 10:15amyou know that cos^2 = 1-sin^2

the rest is just algebra I

I dropped the thetas just for ease of typing.

Naturally, sin can never be 2, so that's a non-solution, even though it does satisfy the original equation.

**Related Questions**

Trig - Which expression equivalent to: cos(theta + pi/2). A)cos theta B)-cos ...

Trigonometry - determine real numbers a and b so that the expression 8sin^2(...

trigonometry - can you correct the rest for me please? Express each as a ...

trigonometry - can you correct the rest for me please? Express each as a ...

Calculus - I wanted to confirm that I solved these problems correctly (we had to...

math(Trigonometry) - sin 2 theta + cos theta = 0 so, we use sin 2 theta = 2 sin ...

Trigonometry - Thank you STEVE!!!!! Suppose that Cos (theta) = 1/square root 2 ...

Trigonometry - State the amplitude of the following functions: a) y = cos theta ...

Mathamatics - Solve the following trigonometry identities. a) 1-cos2(theta) = ...

Algebra II - Multiple Choice Which expression is NOT equivalent to 1? (theta) ...