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

Question

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)

David · Accepted Answer

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

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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