If tan 39°/cot 51°+sin 39°/cos 51°=cosec A,then evaluate 2sin A +4 cos ² A -5 cosec A + 2 cot² A.
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Step-by-step explanation:
cosecA= tan (90- 51)°/cot51° + sin(90-51)°/cos51°
cpsecA = cot51°/cot51°+ cos51°/cos51°
cosecA = 1 + 1 = 2 , cosecA = cosec 30°
A = 30°
2Sin30° + 4cos^2 30° - 5cosec30° + 2cot^2 30°
= 1 + 3 - 10 + 6 = 0
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