Question

Sir please tell how to solve this with explanation
2*70.93/2*sin (7.33 degree)​

Answer 1

Step-by-step explanation:

7½° lies in the first quadrant.

Therefore, sin 7½° is positive.

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

Therefore, cos 15° = cos (45° - 30°)

cos 15° = cos 45° cos 30° + sin 45° sin 30°

=

1

√2

∙

√3

2

+

1

√2

∙

1

2

=

√3

2√2

+

1

2√2

=

Answer 2

7½° lies in the first quadrant.

Therefore, sin 7½° is positive.

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

Therefore, cos 15° = cos (45° - 30°) 

cos 15° = cos 45° cos 30° + sin 45° sin 30°

           = 1√21√2∙√32√32 + 1√21√2∙1212

           = √32√2√32√2 + 12√212√2

           = √3+12√2