SHOW THE FOLLOWING WITHOUT USING TRIGONOMETRY TABLE:-
(vii) cosec 39° cos 51° + tan 21°cot 69º - Sec²21° =0
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answer for the given problem is given
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--》cosec 39° cos 51° + tan 21°cot 69º - Sec²21° =0
--》cosec(90°-51° )cos 51° + tan 21°cot(90°-69º - Sec²21° =0
--》sec 51° cos 51° + tan 21° tan 21° - Sec²21° = 0
--》1+ tan²21°-Sec²21° = 0
--》1+(-1)= 0 (∵ tan²21° - Sec² 21° = -1)
--》0
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