8.3 2(ii)

प्रश्न – 2   दिखाइए कि

(ii) cos38⁰ cos52⁰ - sin38⁰ sin52⁰ = 0

हल – L.H.S लेने पर

= cos38⁰ cos52⁰ - sin38⁰ sin52⁰

= cos(90⁰ - 52⁰) cos52⁰ – sin(90⁰ – 52⁰) sin52⁰

= sin52⁰ cos52⁰ - cos52⁰ sin52⁰

= sin52⁰ cos52⁰ - sin52⁰ cos52⁰

= 0 = R.H.S

L.H.S = R.H.S