Question

5. If sin A=1/2, then find the value of cos A.​

Answer 1

Step-by-step explanation:

SinA =1/2=p/h

by applying Pythagoras theorem

b= ✓h²-p²

b=✓2²-1²

b=√3

cosA=b/h

=✓3/2

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Answer 2

sin²A + cos²A = 1

(1/2)² + cos²A = 1

cos²A = 1 - 1/4

cos A = √(3/4)

cos A = √3/2

or, directly we can say,

sin A = 1/2 at A = 30°

so, cos A = cos 30° = √3/2

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