Question

(iv) cos 15° - cos 75°
sin 75º - sin 15°​

Answer 1

1》cos15°-cos75°

=>cos (90°-75°)-cos75°

=>sin75°-cos75°

2》sin75°-sin15°

=>sin75°-sin(90°-75°)

=>sin75°-cos75°.

hope this helps.

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