Question

value of cos 157.5 degree​

Answer 1

Answer:

157 rupees

5 paisa

157–5=152 is the answer

Answer 2

Cos 157.5º=-cos (180º-157.5º)=-cos 22.5=-cos(45/2)

cos Ф/2=⁺₋√((1+cosФ)/2).

In this case 157.5º is in the second quadrant, therefore we use the following equation:

cos Ф/2=-√((1+cosФ)/2). (we will have a negative number)

cos 157.5º=-cos (45/2)=-√((1+cos 45º)/2)

=-√((1+√2/2)/2)

=-√((2+√2)/4)

=-√(2+√2) / 2 (≈-0.92387...)

Answer: cos 157.5º= -√(2+√2) / 2

Hope it's helpful.

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