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Question

Prove that sin60o+sin30osin60osin30o=tan60o+tan45otan60otan45o

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Solution

sin60°=32;sin30°=12;tan60°=3;tan45°=1
sin60°+sin30°sin60°sin30°=32123212=3+131
tan60°+tan45°tan60°tan45°=3+131=sin60°+sin30°sin60°sin30° proved

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