Question

do this please...........fast_-!_
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Answer 1

Answer:arcsin(12/13)+arccos(3/4)+arct--an(63/16)

by apply triangle law

arcsin(12/13)=arctan(12/5)

arccos(4/5)=arctan(3/4)

now

arctan(12/5)+arctan(3/4)+arctan(63/16)

using Formula

arctan(x)+arctan(y)=arctan(x+y/1-xy)

arctan(12/5)+arctan(3/4)+arctan(63/16)

arctan(-63/16)+arctan(63/16)

arctan(-α)=-arctan(α)

so,

arctan(63/16)-arctan(63/16)

applying arctan(x)-arctan(y)

=arctan(x-y/1+xy)

arctan(63/16-63/16/1+63/16*63/16)

arctan(0)=pie

Step-by-step explanation: