Question #ca510
2 Answers
Jan 11, 2018
See the answer below...
Explanation:
#cos2theta#
#=cos^2theta-sin^2theta#
#=(1-sin^2theta)-sin^2theta" "# [As#color(red)(sin^2theta+cos^2theta=1# ]
#=1-2sin^2theta#
#=1-2/csc^2theta#
#=1-2/(1+cot^2theta)" "# [As#color(red)(csc^2theta-cot^2theta=1# ]Hence,
#costheta=color(red)(|ul(bar(1-2/(1+cot^2theta)|# Hope it helps...
Thank you...
Jan 11, 2018
The answer is
Explanation:
Dividing by
Therefore,