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Calculating ranges of sins and cos on the quartant

• To: mathgroup at smc.vnet.net
• Subject: [mg2093] Calculating ranges of sins and cos on the quartant
• From: tycck at technet.sg (Tommy Cheung Chi King)
• Date: Fri, 29 Sep 1995 01:14:42 -0400
• Organization: Pacific Internet, Singapore

  How can I find ranages of values,

  e.g. 2cos Theta + 3sin Theta = 1.234 ?

 Do help, How can I see the steps mathematica take to do it? I would
like to know, I am very weak in Trigo. Thanks.