If D=`|{:(1,sina,1),(-sina,1,sina),(-1,-sina,1):}|`, show that, `2 le D le 4`.

If (1-sinA)(1-sinB)(1-sinC)=(1+sinA)(1+sinB)(1+sinC) , then show that each side is equal to +-cosAcosBcosC .

sqrt((1+sinA)/(1-sinA))

If (1+sinA)(1+sinB)(1+sinC)=(1-sinA) (1-sinB)(1-sinC)," then prove that "(1-sinA) (1-sinB)(1-sinC)=pmcosA.cosB.cosC .

What is (1+sinA)/(1-sinA)-(1-sinA)/(1+sinA) equal to ?

((2sinA)(1+sinA))/(1+sinA+cosA) is equal to:

((2sinA)(1+sinA))/(1+sinA+cosA) is equal to:

Prove: (1+cosA)/(sinA)=(sinA)/(1-cosA)