the answer to this question is -2. cant the answer be ‘independent of alpha’?
the answer to this question is -2. cant the answer be ‘independent of alpha’?
Ishita Hariramani , 9 Years ago
Grade 10
Trigonometry> the answer to this question is -2. cant t...
1 AnswersVikas TU
i can provide u a hint and then u can do it by yourself.
simply apply formulae:
cos(A+B) + cos(A-B) = 2cosAcosB
for those two cosine terms,
U WOULD get cos2alpha and cos120
write cos2alpha in sin term and then solve u would get -2 as the answer.
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