Evaluate the expression: v ⋅ w Given the vectors: r = ; v = ; w = (2 points)

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Ответ:

zeldawhite76

08.08.2020

Mathematics

d. Both a and c

Step-by-step explanation:

We know that,

$\sin (90^{\circ}-x)=\cos x$

a. sin 18° = cos 72°

Putting $18^{\circ} = 90^{\circ}-72^{\circ}$

$\sin 18^{\circ} =\sin (90^{\circ}-72^{\circ})=\cos 72^{\circ}$

Therefore it is true.

b. sin 55° = cos 55°

Putting $55^{\circ} = 90^{\circ}-35^{\circ}$

$\sin 55^{\circ} =\sin (90^{\circ}-35^{\circ})=\cos 35^{\circ}$

Therefore, it is not true.

c. sin 72° = cos 18°

Putting $72^{\circ} = 90^{\circ}-18^{\circ}$

$\sin 72^{\circ} =\sin (90^{\circ}-18^{\circ})=\cos 18^{\circ}$

Therefore it is true.

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