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3 years ago

1.5(−2.4+(−5.3)) = ?

Mathematics

2 answers:

ddd [48]3 years ago

4 0

1.5(-2.4+(-5.3))=1.5(-2.4-5.3)=1.5(-7.7)=-11.55

FinnZ [79.3K]3 years ago

3 0

-11.55 is the answer.

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If sinA+cosecA=3 find the value of sin2A+cosec2A

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$\sin 2A + \csc 2A = 2.122$

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Let $f(A) = \sin A + \csc A$ , we proceed to transform the expression into an equivalent form of sines and cosines by means of the following trigonometrical identity:

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$\sin A + \csc A = 3$

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Since sine is a bounded function between -1 and 1, the only solution that is mathematically reasonable is:

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Then, the values of the cosine associated with that angle is:

$\cos A \approx 0.924$

Now, we have that $f(A) = \sin 2A +\csc2A$ , we proceed to transform the expression into an equivalent form with sines and cosines. The following trignometrical identities are used: