Question

please.solve this trigonometary any of them.

Answer 1

1.

First simplyfy 3cos55/7sin35

=3cos (90-35)/7sin35

= 3sin35/7sin35

=3/7

Now simplify 4cos70×cosec20/7 (tan5xtan25xtan45xtan65xtan85)

= 4cos70x cosec (90-70)/7(tan5xtan25xtan45xcot5xcot25)

=4cos70xsec70/7 (1)

=4/7

Now come to ques..

What we have to find:-

=3cos55/7sin35-4cos70cosec20/7 (tan5xtan25xtan45xtan65xtan85)

=3/7-4/7

=-1/7 ans...