Hi guys could you please help me to prove cos3a-cos7a/sin7a+sin3a=tan2a
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Originally Posted by bahram Hi guys could you please help me to prove cos3a-cos7a/sin7a+sin3a=tan2a Just to clarify the problem, is this correct?
is the question or ? Your syntax is a little unclear. Either way you may find this indentity useful: this also applies for cos and tan.
Originally Posted by bahram Hi guys could you please help me to prove cos3a-cos7a/sin7a+sin3a=tan2a
thanks skeeter. it's the best one
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