2)COS12 – SIN12 /CO12+SIN12 + SIN147/ COS147\t1\t-1\t0\tNONE
KRISHA SHETH , 6 Years ago
Grade 11
Trigonometry> 2)COS12 – SIN12 /CO12+SIN12 + SIN147/ COS...
1 Answers
Arun
Last Activity: 6 Years ago
Dear Krisha
[cos(90-78) - sin12/ cos(90-78) + sin12 ] + sin147/cos147]
= [sin78 - sin12]/[sin78 + sin12] +sin(180-33)/cos(180-33)
= [(2 cos 45 sin 33)/(2 sin 45 cos33)] + sin 33/(-cos 33)
Since cos 45 = sin 45, hence they can be cancelled
= Sin 33/ cos33 - sin 33/cos33
= 0
Regards
Arun (askIITians forum expert)
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