1.

PQR is an isosceles triangle whose equal sides PQ and PR are at right angles S and T are points on PQ such that QS = 6 (SP) " and " QT = 2 (TP) " and if" angle PRS = theta , angle PRT = phithen

Answer»

`sin 2 PHI = 3//5`
`2 phi + theta = pi//4`
`SIN2 theta = 3//5`
` sin phi + cos phi = 4/sqrt10`

Answer :A::B::D


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