Question 5:

Find the value of:

(i) sin 75°

(ii) tan 15°

Answer

  (i) sin 75° = sin (45° + 30°)

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

[sin (x + y) = sin x cos y + cos x sin y]

(ii) tan 15° = tan (45° − 30°)

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