Tanθ/2= 5/2 and tanФ/2= ¾ then cos(θ +Ф ) = ????????
Tanθ/2= 5/2 and tanФ/2= ¾ then cos(θ +Ф ) = ????????
Akhila malladi , 7 Years ago
Grade 7
Trigonometry> Tanθ/2= 5/2 and tanФ/2= ¾ then cos( θ + Ф...
1 Answers
Preetham Reddy
From the formula sinx=2tan(x/2)/1+tan^2(x/2) using this formula find sinx from which u can get cos x and the using cos(a+b)= cosa.cosb-sina.sinb u will get the required answer.Hope it helps
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