<prompt> Rahisisha cos 10circ cos 30circ cos 50circ cos 70circ.  <response>: Kutoka kwa fomula ya bidhaa hadi jumla, cos 50circ cos 70circ frac12 cos 120circ cos 20circ, hivyoanzaaligncos 10circ cos 30circ cos 50circ cos 70circ cos 10circ cdot fracsqrt32 cdot frac 12 cos 120circ cos 20circ fracsqrt34 cos 10circ cos 120circ cos 20circ fracsqrt34 cos 10circ cos 120circ cos 10circ cos 20circ fracsqrt34 kushoto -frac12 cos 10circ cos 10circ cos 20circ kulia.endalignTunapata tena kutumia fomula ya jumla ya bidhaa hadi jumlaanzaalignfracsqrt34 kushoto -frac12 cos 10circ cos 10circ cos 20circ kulia frac sqrt34 kushoto -frac12 cos 10circ fraccos 30circ cos 10circ2 haki fracsqrt38 cos 30circ frac316.mwishopanga 