Prove cos 5-sin 25 =sin 35 immediately correct answer
Naresh , 6 Years ago
Grade 12th pass
Trigonometry> Prove cos 5-sin 25 =sin 35 immediately co...
1 Answers
Devang
Last Activity: 6 Years ago
L.H.S = cos5 – sin 25
= sin 95 – sin 25 [ sin(90+5) = cos5 ]
= 2 * cos (95+25)/2 * sin (95-25)/2
= 2 * cos60 * sin35
=2 * ½ * sin35 (cos60 = ½ )
= sin35
= R.H.S
hence L.H.S = R.H.S
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