Introduction to Trigonometry
Without using trigonometrical tables, evaluate the following:sin228o+sin262o−tan245o
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If sec2θ+tan2θ=1213, then sec4θ−tan4θ=.......... .
1−sec2θcos2θ−1 is equal to:
Prove the following identities , where the angles involved are acute angles for which the expression are defined.(i)cosA+sinA−1cosA−sinA +1=cosecA+cotA using the identity cosec2A=1+cot2A
Without using trigonometric tables, prove that:cos257o−sin233o=0
Prove each of the following identities:(sec2θ−1)(csc2θ−1)=1
Choose the correct option and justify your choice:1+tan230∘ 2tan30∘ =
If cos θ=0.6, show that (5sinθ−3tanθ)=0.
If acosθ−b sinθ=c, then a sinθ+bcosθ equals-