Question

Guys pls send the answer please

Answer 1

Step-by-step explanation:

replace θ by A

cosAsinA-sinAcosAcos(90-A)/sec(90-A) -cosAsinAsin(90-A)/cosec(90-A)

=cosAsinA-sinAcosAcos²(90-A)- cosAsinAsin²(90-A)

=cosAsinA{1-cos²(90-A)-sin²A(90-A)}

=-cosAsinA{sin²(90-A)+cos²(90-A)-1}

=-cosAsinA(1-1)

=0