What is the value of (1/2)sec(80)-2sin(70) ?

The value of (1/2)sec(80)-2sin(70) is 1

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(1/2)sec(80)-2sin(70)

(\frac{1}{2}) sec (8 0^{\circ}) - 2 sin (7 0^{\circ})

1

Solution steps

(\frac{1}{2}) sec (8 0^{\circ}) - 2 sin (7 0^{\circ})

Refine to a decimal form

= 1

arctan (\frac{4}{19})

cos (5 7^{\circ}) cos (3 3^{\circ}) - sin (5 7^{\circ}) sin (3 3^{\circ})

arctan (\frac{1}{2}) - arctan (- \frac{1}{2})

arctan (1.02)

1 + 0.2 \cdot (\frac{1.2}{2}) \cdot tan^{2} (6 0^{\circ})

What is the value of (1/2)sec(80)-2sin(70) ?
The value of (1/2)sec(80)-2sin(70) is 1