evaluate : sin 50 /cos 40 + cosec 40 / sec 50 - 4 cos 50 cosec 40
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Step-by-step explanation:
sin 50 / cos 40 + cosec 40 / sec 50 - 4 cos 50 cosec 40
= (sin 90 - 40) / cos 40 + (cosec 90 - 50) / sec 50 - 4 (cos 90 - 40) 1/sin 40
= cos 40 / cos 40 + sec 50 / sec 50 - sin 40 * 1/ sin 40
= 1 +1 - 4 *1
= 2 - 4
= -2
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