Question

find the values of sin 9°, cos 9° and tan 9°

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Answer 1

U can solve by using formulae

Answer 2

Let us first convert degrees into radians

Therefore 9°= 9×π/180 = π/20 = 0.157

Now Sin x tends to x as x tends to 0

Therefore sin .157 = 0.157

The cos of 9 degrees is 0.98769, .

To obtain 9 degrees in radian multiply 9° by

π

/ 180° = 1/20

π

. Cos 9degrees = cos (1/20 ×

π

) that is 0.98769.

The tan of 9 degrees is 0.15838

, To obtain 9 degrees in radian multiply 9° by π / 180° = 1/20 π. Tan 9degrees = tan (1/20 × π).

that given tan 9 degree is 0.15838

.