1.

Without using trigonometric tables, evaluatesin39°cos51

Answer»

=sin39/cos51 + 2tan11tan31tan45tan59tan79 - 3(sin^221+ sin^269)

=1 + 2cot79cot59tan45tan59tan79 - 3(sin^221 + cos^221) (sin teeta = cos(90 - teeta))

(tana a = 1/cota)

=1 + 2 - 3

=0

than1



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