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ZeHanzBest ResponseYou've already chosen the best response.0
I'll switch to x instead of theta, typing is a lot easier then... Your equation: cos2x+10sin²x=7. There is a (wellknown) formula for cos2x: cos2x=12sin²x. If we put that in place of cos2x, we get: 12sin²x+10sin²x=7, which after cleaning up becomes: 8sin²x=6. I think it's your turn to do the next step now...
 one year ago
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