If sin a + sin b = 2 , then find the value of cos a + cos b
kunal gupta , 8 Years ago
Grade 10
Trigonometry> If sin a + sin b = 2 , then find the valu...
1 Answers
Shaswata Biswas
Last Activity: 8 Years ago
We know 
, and 
.
Here, sina + sinb = 2
It is only possible when sina = sinb = 1.
=> a = b = π/2
So the value of cosa + cosb = cos(π/2) + cos (π/2) = 0.
THANKS
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