3 years ago

What is the value of the following expression? 2 x {6 + [12 + (3 + 1)]} - 1

Mathematics

1 answer:

dedylja [7]3 years ago

8 0

Answer:

Step-by-step explanation:

2*(18+3+1)-1

2*(21+1)-1

2*22-1

44-1

A=43

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We are given that:

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$\cos 2y=\tan ^2x$

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so using above two formula in equation (2) we get:

$\cos 2y=\dfrac{1-(1-2\sin ^2x)}{1+2\cos ^2x-1}\\\\\cos 2y=\dfrac{1-1+2\sin ^2x}{2\cos ^2x}\\\\\cos 2y=\dfrac{2\sin ^2x}{2\cos ^2x}\\\\\cos 2y=\tan ^2x$

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4 years ago