How you do it is to use the formula
sinA+sinB=2sin((A+B)/2)cos((A-B)/2) and
cosA+cosB=2cos((A+B)/2)COS((A-B)/2)
Use A=4θ, B=10θ
Darlene M.
asked • 10/24/14how do i verify the identity sine 4theta + sine 10theta / cosine 4theta + cosine 10theta = tan 7theta?
how do i verify the identity sine 4theta + sine 10theta / cosine 4theta + cosine 10theta = tan 7theta?
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