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OpenStudy (anonymous):
Using sum and difference identities, establish the reductions formula. cot〖(-7π/2- φ)=tanφ〗 sin〖(3π/2- x)= -cosx 〗 Prove the following identities. cscx/secx 〖=(1+cotx)/(1+tanx )〗 (sin〖1/2 x-cos〖1/2 x)²=1-sinx 〗 〗 Find the exact value. sin〖50°cos〖40°+〖sin 〗〖40°cos〖50°〗 〗 〗 〗 tan〖π/3+tan〖π/6〗 〗/(1-tan〖π/3 tanπ/6〗 )
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