haleyhusted haleyhusted

09-11-2021
Mathematics

contestada

Find the exact value of the expression. cos(160°) cos(10°) + sin(160°) sin(10°)

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surjithayer10otahza surjithayer10otahza

10-11-2021

Answer:

Step-by-step explanation:

cos a cos b+sin a sin b=cos (a-b)

cos 160 cos 10+sin 160 sin 10=cos (160-10)

=cos 150

=cos (180-30)

=-cos 30

=-√3/2

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