Sin 7theta/ sintheta in terms of cos theta give the answer
Amisha , 5 Years ago
Grade 12th pass
Trigonometry> Sin 7theta/ sintheta in terms of cos thet...
1 AnswersVikas TU
Last Activity: 5 Years ago
Hiii Amisha
Sin 7Q / SinQ
expand 7Qas (6Q + Q)
and apply the formula sin(A+B)
so it wil be sin (6Q+Q)/ Sin Q
=> (Sin6Q * CosQ )/SinQ + Cos 6Q
now exapnd Sin6Q as (5Q + Q)
and keep on calculting,
The ans will come as CosQ+Cos2Q+Cos3Q+Cos4Q+Cos5Q+Cos6Q
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