Question

Value of cot7 1/2 degree??

Answer 1

Answer:

7½° lies in the first quadrant

as a result, both sin 7½° and cos 7½° is positive.

For all values of the angle A we know that, sin (α - β) = sin α cos β - cos α sin β.

sin 15° = sin (45° - 30°)

                        = 1/√2∙√3/2 - 1/√2∙1/2

                        = √3/2√2 - 1/2√2

                        = √3−1/2√2

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