Hi! How do you prove that tan(∅+Φ) = (tan ∅ + tan Φ)/ (1- tanΦtan∅)? I'm able to prove the formulas for sin and cos (∅+Φ) but when i use sin/ cos = tan, it doesnt give me the above formula.. thanks
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Originally Posted by alexandrabel90 Hi! How do you prove that tan(∅+Φ) = (tan ∅ + tan Φ)/ (1- tanΦtan∅)? I'm able to prove the formulas for sin and cos (∅+Φ) but when i use sin/ cos = tan, it doesnt give me the above formula.. thanks This is really a topic for the trigonometry section. But all you need to know are the formulae for the sine and cosine of a sum. Divide the numerator and the denominator by
Originally Posted by alexandrabel90 Hi! How do you prove that tan(∅+Φ) = (tan ∅ + tan Φ)/ (1- tanΦtan∅)? I'm able to prove the formulas for sin and cos (∅+Φ) but when i use sin/ cos = tan, it doesnt give me the above formula.. thanks Of course it gives the above formula: Now simply multiply the right hand above by and develop. Tonio
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