Question

given sinA,find sinA/2,cosA/2and tanA/2​

Answer 1

Answer:

find sinA/2,cosA/2and tanA/2

Step-by-step explanation:

2cos^2 A/2 = 1 + cos A

⇒ cos^2 A/2 = (1 + cos A)/2

⇒ cos A2 = ± 1+cosA2−−−−−√

Answer 2

Answer:

Again we look at the quadrant; since A is between 90o and 180o, A/2 is between 45o and 90o. That is, it is in the first quadrant - so its sine is positive. So our answer is: sin (A/2) =

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