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Tanθ/2= 5/2 and tanФ/2= ¾ then cos( θ + Ф ) = ????????

 
Tanθ/2= 5/2 and  tanФ/2= ¾ then cos(θ +Ф ) = ????????
 

Grade:7

1 Answers

Preetham Reddy
45 Points
3 years ago
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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