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OpenStudy (anonymous):
Prove algebraically that the equation is an identity. (5cosC-2sinC)^2+(2cosC+5sinC)^2=29
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OpenStudy (anonymous):
one can relativley see that an answer is 29 proof.|dw:1318257384834:dw|
OpenStudy (anonymous):
Sorry, but i can't understand the last 3 lines of this.
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