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3. Sec2o + cosec 20 - sec2o?
x cosec20
Answers
Answered by
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Answer: √3 cosec 20° - sec 20°
= √3/ sin 20° - 1/ cos 20°
= √3cos 20° - sin 20°/ sin 20° cos 20°
= 4 [√3/2 cos 20° - 1/2 sin 20° / 2 sin 20° cos 20°]
= 4 [ sin 60° cos 20° - cos 60° sin 20°/ sin 40°] -- ( 2 sin A cos A = sin 2A)
Using identity sin ( A - B ) = sin A cos B - cos A sin B
= 4 sin (60° - 20°) / sin 40°
= 4 sin 40°/ sin 40°
= 4
Step-by-step explanation:
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0
Answer:
Step-by-step explanation:sec90
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