Find the range!

cos 2φ/ sin 3φ < 0, if φ lies in:

(a) {(13Ï€/48),(14Ï€/48)}
(b) {(14Ï€/48),(18Ï€/48)}
(c) {(18Ï€/48),(23Ï€/48)}
(d) {(Ï€/2),Ï€}

3 Answers

62
Lokesh Verma ·

Hint: Draw the graph.. of cos 2φ and sin 3φ individually..

or else think of it like cos 2φ x sin 3φ < 0

because you are multiplying by sin2 3φ

Can you pull this off now?

1
Soumi Dasgupta ·

Thanx..... But xyz.. which option is correct?

1
Soumi Dasgupta ·

The answer is not there at present....

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