What is the value of 7cos((3pi)/4)-7cos(pi/4) ?

The value of 7cos((3pi)/4)-7cos(pi/4) is -7sqrt(2)

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7cos((3pi)/4)-7cos(pi/4)

7 cos (\frac{3 π}{4}) - 7 cos (\frac{π}{4})

- 72

Solution steps

7 cos (\frac{3 π}{4}) - 7 cos (\frac{π}{4})

Use the following trivial identity:

cos (\frac{3 π}{4}) = - \frac{2}{2}

Use the following trivial identity:

cos (\frac{π}{4}) = \frac{2}{2}

= 7 (- \frac{2}{2}) - 7 \cdot \frac{2}{2}

Simplify

7 (- \frac{2}{2}) - 7 \cdot \frac{2}{2} : - 72

= - 72

\frac{( 7.01 ) ^{2} \cdot sin ( 2 \cdot 35 )}{15.39}

tan (arccsc (- 5))

10 cos (2 π)

58 cos (54.0 4^{\circ})

tan (- \frac{5}{12})

What is the value of 7cos((3pi)/4)-7cos(pi/4) ?
The value of 7cos((3pi)/4)-7cos(pi/4) is -7sqrt(2)