write the expression below as the cosine of angle knowing that the epxression is the right side of the for formula for cos(a-B) with particular values for a and B. cos (155degrees) cos (35degrees)+sin...

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write the expression below as the cosine of angle knowing that the epxression is the right side of the for formula for cos(a-B) with particular values for a and B. cos (155degrees) cos (35degrees)+sin (155degrees) sin (35degrees)

Answered Same DayDec 27, 2021

Answer To: write the expression below as the cosine of angle knowing that the epxression is the right side of...

David answered on Dec 27 2021

117 Votes

SOLUTION-

We have the formula for difference of two angles of cosine
as cos(A-B)= cosA cosB- sinA sinB

We have (cos155’cos135’+sin155’sin35’)

By using above formula we can write (cos155’cos35’+sin155’sin35’)= cos(155’-35’)=cos120’=-1/2

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write the expression below as the cosine of angle knowing that the epxression is the right side of the for formula for cos(a-B) with particular values for a and B. cos (155degrees) cos (35degrees)+sin...

Answer To: write the expression below as the cosine of angle knowing that the epxression is the right side of...

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